Use single underscore variable in loop iteration(in identity)

This is to do the same cleanup in identity as
Ie83d6533a6566a22ca78f9ea60a7be1c94531065,
when loop variable is not really used, then use
single underscore as the variable name.

Change-Id: I618c0dcc70bad8c0db7cea0e9783ab14e930452b
diff --git a/tempest/api/identity/admin/v2/test_endpoints.py b/tempest/api/identity/admin/v2/test_endpoints.py
index 651a316..0da579c 100644
--- a/tempest/api/identity/admin/v2/test_endpoints.py
+++ b/tempest/api/identity/admin/v2/test_endpoints.py
@@ -34,7 +34,7 @@
         cls.service_ids.append(cls.service_id)
         # Create endpoints so as to use for LIST and GET test cases
         cls.setup_endpoints = list()
-        for i in range(2):
+        for _ in range(2):
             region = data_utils.rand_name('region')
             url = data_utils.rand_url()
             endpoint = cls.endpoints_client.create_endpoint(
diff --git a/tempest/api/identity/admin/v3/test_credentials.py b/tempest/api/identity/admin/v3/test_credentials.py
index a0d8748..d4fe32d 100644
--- a/tempest/api/identity/admin/v3/test_credentials.py
+++ b/tempest/api/identity/admin/v3/test_credentials.py
@@ -31,7 +31,7 @@
         u_desc = '%s description' % u_name
         u_email = '%s@testmail.tm' % u_name
         u_password = data_utils.rand_password()
-        for i in range(2):
+        for _ in range(2):
             cls.project = cls.projects_client.create_project(
                 data_utils.rand_name('project'),
                 description=data_utils.rand_name('project-desc'))['project']
@@ -92,7 +92,7 @@
         created_cred_ids = list()
         fetched_cred_ids = list()
 
-        for i in range(2):
+        for _ in range(2):
             blob = '{"access": "%s", "secret": "%s"}' % (
                 data_utils.rand_name('Access'), data_utils.rand_name('Secret'))
             cred = self.creds_client.create_credential(
diff --git a/tempest/api/identity/admin/v3/test_endpoints.py b/tempest/api/identity/admin/v3/test_endpoints.py
index 655e4ef..ef450a2 100644
--- a/tempest/api/identity/admin/v3/test_endpoints.py
+++ b/tempest/api/identity/admin/v3/test_endpoints.py
@@ -40,7 +40,7 @@
         cls.service_ids.append(cls.service_id)
         # Create endpoints so as to use for LIST and GET test cases
         cls.setup_endpoints = list()
-        for i in range(2):
+        for _ in range(2):
             region = data_utils.rand_name('region')
             url = data_utils.rand_url()
             interface = 'public'
diff --git a/tempest/api/identity/admin/v3/test_groups.py b/tempest/api/identity/admin/v3/test_groups.py
index 3cbcc1f..34b4468 100644
--- a/tempest/api/identity/admin/v3/test_groups.py
+++ b/tempest/api/identity/admin/v3/test_groups.py
@@ -80,7 +80,7 @@
         self.addCleanup(self.groups_client.delete_group, group['id'])
         # add user into group
         users = []
-        for i in range(3):
+        for _ in range(3):
             name = data_utils.rand_name('User')
             password = data_utils.rand_password()
             user = self.users_client.create_user(name=name,
@@ -110,7 +110,7 @@
         self.addCleanup(self.users_client.delete_user, user['id'])
         # create two groups, and add user into them
         groups = []
-        for i in range(2):
+        for _ in range(2):
             name = data_utils.rand_name('Group')
             group = self.groups_client.create_group(
                 name=name, domain_id=self.domain['id'])['group']
diff --git a/tempest/api/identity/admin/v3/test_regions.py b/tempest/api/identity/admin/v3/test_regions.py
index 95894a6..b5ea90d 100644
--- a/tempest/api/identity/admin/v3/test_regions.py
+++ b/tempest/api/identity/admin/v3/test_regions.py
@@ -30,7 +30,7 @@
     def resource_setup(cls):
         super(RegionsTestJSON, cls).resource_setup()
         cls.setup_regions = list()
-        for i in range(2):
+        for _ in range(2):
             r_description = data_utils.rand_name('description')
             region = cls.client.create_region(
                 description=r_description)['region']
diff --git a/tempest/api/identity/admin/v3/test_users.py b/tempest/api/identity/admin/v3/test_users.py
index 3ec4ff1..54c62c7 100644
--- a/tempest/api/identity/admin/v3/test_users.py
+++ b/tempest/api/identity/admin/v3/test_users.py
@@ -125,7 +125,7 @@
 
         user = self.users_client.show_user(user_body['id'])['user']
         role = self.roles_client.show_role(role_body['id'])['role']
-        for i in range(2):
+        for _ in range(2):
             # Creating project so as to assign role
             project_body = self.projects_client.create_project(
                 data_utils.rand_name('project'),
diff --git a/tempest/api/identity/v2/test_users.py b/tempest/api/identity/v2/test_users.py
index bafb1f2..06730f8 100644
--- a/tempest/api/identity/v2/test_users.py
+++ b/tempest/api/identity/v2/test_users.py
@@ -58,7 +58,7 @@
         if CONF.identity_feature_enabled.security_compliance:
             # First we need to clear the password history
             unique_count = CONF.identity.user_unique_last_password_count
-            for i in range(unique_count):
+            for _ in range(unique_count):
                 random_pass = data_utils.rand_password()
                 self._update_password(
                     user_id, original_password=new_pass, password=random_pass)
diff --git a/tempest/api/identity/v3/test_users.py b/tempest/api/identity/v3/test_users.py
index f389a8f..9592cb9 100644
--- a/tempest/api/identity/v3/test_users.py
+++ b/tempest/api/identity/v3/test_users.py
@@ -60,7 +60,7 @@
         if CONF.identity_feature_enabled.security_compliance:
             # First we need to clear the password history
             unique_count = CONF.identity.user_unique_last_password_count
-            for i in range(unique_count):
+            for _ in range(unique_count):
                 random_pass = data_utils.rand_password()
                 self._update_password(
                     original_password=new_pass, password=random_pass)
@@ -142,7 +142,7 @@
 
         # Lock user account by using the wrong password to login
         bad_password = data_utils.rand_password()
-        for i in range(CONF.identity.user_lockout_failure_attempts):
+        for _ in range(CONF.identity.user_lockout_failure_attempts):
             self.assertRaises(exceptions.Unauthorized,
                               self.non_admin_token.auth,
                               user_id=self.user_id,