Fix API tests

Patch https://review.openstack.org/#/c/256164/
broke the Neutron API job by unsetting Tempest configuration
values that were unused by Tempest, but used by Neutron's fork
of Tempest. This patch copies credentials from the 'auth' section
to the 'identity' section.

The longer term plan is detailed here:
https://etherpad.openstack.org/p/neutron-tempest-defork
TL;DR: Removed overlap of tests between the Tempest and Neutron
repos, then use Tempest's plugin architecture for the tests that
will remain in the Neutron repo.

Change-Id: Ieb396cfd17f9cb66776ead11e7f760c1c26a0b08
diff --git a/neutron/tests/tempest/config.py b/neutron/tests/tempest/config.py
index 256d687..e1f207f 100644
--- a/neutron/tests/tempest/config.py
+++ b/neutron/tests/tempest/config.py
@@ -59,7 +59,19 @@
                      "number of concurrent test processes."),
     cfg.ListOpt('tempest_roles',
                 help="Roles to assign to all users created by tempest",
-                default=[])
+                default=[]),
+    cfg.StrOpt('admin_username',
+               help="Administrative Username to use for "
+                    "Keystone API requests."),
+    cfg.StrOpt('admin_tenant_name',
+               help="Administrative Tenant name to use for Keystone API "
+                    "requests."),
+    cfg.StrOpt('admin_password',
+               help="API key to use when authenticating as admin.",
+               secret=True),
+    cfg.StrOpt('admin_domain_name',
+               help="Admin domain name for authentication (Keystone V3)."
+                    "The same domain applies to user and project"),
 ]
 
 identity_group = cfg.OptGroup(name='identity',
@@ -119,18 +131,6 @@
     cfg.StrOpt('alt_domain_name',
                help="Alternate domain name for authentication (Keystone V3)."
                     "The same domain applies to user and project"),
-    cfg.StrOpt('admin_username',
-               help="Administrative Username to use for "
-                    "Keystone API requests."),
-    cfg.StrOpt('admin_tenant_name',
-               help="Administrative Tenant name to use for Keystone API "
-                    "requests."),
-    cfg.StrOpt('admin_password',
-               help="API key to use when authenticating as admin.",
-               secret=True),
-    cfg.StrOpt('admin_domain_name',
-               help="Admin domain name for authentication (Keystone V3)."
-                    "The same domain applies to user and project"),
 ]
 
 identity_feature_group = cfg.OptGroup(name='identity-feature-enabled',
@@ -1148,6 +1148,18 @@
         self.input_scenario = cfg.CONF['input-scenario']
         self.cli = cfg.CONF.cli
         self.negative = cfg.CONF.negative
+
+        self.identity.admin_username = self.auth.admin_username
+        self.identity.admin_password = self.auth.admin_password
+        self.identity.admin_tenant_name = self.auth.admin_tenant_name
+        self.identity.admin_domain_name = self.auth.admin_domain_name
+        self.identity.password = self.auth.admin_password
+        self.identity.tenant_name = 'demo'
+        self.identity.username = 'demo'
+        self.identity.alt_username = 'alt_demo'
+        self.identity.alt_tenant_name = 'alt_demo'
+        self.identity.alt_password = self.auth.admin_password
+
         cfg.CONF.set_default('domain_name', self.identity.admin_domain_name,
                              group='identity')
         cfg.CONF.set_default('alt_domain_name',