Updating the deprecated method used in task add_tor_agent and delete_tor_agent
Updating the deprecated method used in task add_tor_agent and delete_tor_agent

* Method get_keystone_admin_tenant_name  is deprecated using get_admin_tenant_name instead.
* Method get_keystone_ip is deprecated using get_authserver_ip instead.
Closes-bug:1523062
Change-Id: I092a83abac7a9159f77eaa1f2f0fc0b9b3d4e4e0

Juniper/contrail-fabric-utils,Juniper/contrail-fabric-utils