Fix the load balancer service clients

The load balancer service clients were not using the base
service_client_config from tempest, so they would not pick up some
base settings, such as ca_certs, disable_ssl_certificate_validation,
etc.
This patch corrects that so that the clients will get the base
settings from tempest.

Change-Id: Ic7fa0d2e32cb8ff86fe013064e1ce53d4cf0d62e
Story: 2005880
Task: 33698
2 files changed