Remove CONF values from OrchestrationClient

To move OrchestrationClient to tempest-lib, this patch moves
CONF values from OrchestrationClient to the client setting.
In addition, this patch adds default_params into general client
setting class and makes use it for removing default_params values
from service client code in the future.

Change-Id: Ia988862516b7bc1d6e8bd79c671da4ecc2abe8f3
3 files changed