test_list_servers_by_admin(specified_tenant) for preexisting servers

This is the same with 3f9cd0c2668d52af05357ca3a53c58ae441da767

test_list_servers_by_admin_with_specified_tenant expected admin user
should not have any pre-existing servers which may be possible on some
clouds.
As the original purpose of test_list_servers_by_admin_with_specified_
tenant, this is to change to verify the server list doesn't contain
the other tenant's servers.

Change-Id: I6af1b9da4754ca4c1e058ed912e1484708ff6cc7
1 file changed