Replace the usage of 'admin_manager' with 'os_admin'

In tempest, alias 'admin_manager' has been moved to 'os_admin'
'alt_manager' to 'os_alt' and 'manager' to 'os_primary' in
version Pike, and it will be removed in version Queens[1].


[1]I5f7164f7a7ec5d4380ca22885000caa0183a0bf7

Closes-bug: 1697588

Change-Id: Ib41a1bcff70cc7323b90a222c9f64d66e0203e53
diff --git a/neutron/tests/tempest/scenario/base.py b/neutron/tests/tempest/scenario/base.py
index 15a722a..5ccbd1c 100644
--- a/neutron/tests/tempest/scenario/base.py
+++ b/neutron/tests/tempest/scenario/base.py
@@ -41,7 +41,7 @@
     @classmethod
     def resource_cleanup(cls):
         for keypair in cls.keypairs:
-            cls.manager.keypairs_client.delete_keypair(
+            cls.os_primary.keypairs_client.delete_keypair(
                 keypair_name=keypair['name'])
 
         super(BaseTempestTestCase, cls).resource_cleanup()
@@ -89,7 +89,7 @@
 
     @classmethod
     def create_keypair(cls, client=None):
-        client = client or cls.manager.keypairs_client
+        client = client or cls.os_primary.keypairs_client
         name = data_utils.rand_name('keypair-test')
         body = client.create_keypair(name=name)
         cls.keypairs.append(body['keypair'])
@@ -97,7 +97,7 @@
 
     @classmethod
     def create_secgroup_rules(cls, rule_list, secgroup_id=None):
-        client = cls.manager.network_client
+        client = cls.os_primary.network_client
         if not secgroup_id:
             sgs = client.list_security_groups()['security_groups']
             for sg in sgs: