Remove service_client module

This patch makes both negative_rest_client and common part of scenario
tests use rest_client instead of service_client, because that is the
same as rest_client.
In addition, there is nothing to use service_client anymore, so this
patch removes the module also.

Partially implements blueprint consistent-service-method-names

Change-Id: Ic2d4cea4f11222fc7b45eb378cfc32974c1be9b6
4 files changed