Replace the usage of some aliases in tempest

In tempest, following aliases have been moved in version Pike
and will be removed in version Queens:ad
* manager > os_primary [1]
* admin_manager > os_admin [2]
* os_adm > os_admin [3]
* os > os_primary [4]
* alt_manager > os_alt [5]

[1] https://review.openstack.org/#/c/468036/
[2] https://review.openstack.org/#/c/467852/
[3] https://review.openstack.org/#/c/467605/
[4] https://review.openstack.org/#/c/466991/
[5] https://review.openstack.org/#/c/457555/

Change-Id: I76bf4cdec41789646d9079c259a9453107e0c5a6
diff --git a/ceilometer/tests/tempest/api/base.py b/ceilometer/tests/tempest/api/base.py
index 05377e7..ac65c3c 100644
--- a/ceilometer/tests/tempest/api/base.py
+++ b/ceilometer/tests/tempest/api/base.py
@@ -142,4 +142,4 @@
     @classmethod
     def setup_clients(cls):
         super(BaseTelemetryAdminTest, cls).setup_clients()
-        cls.telemetry_admin_client = cls.os_adm.telemetry_client
+        cls.telemetry_admin_client = cls.os_admin.telemetry_client