Move _get_region() to NegativeRestClient
_get_region() was used for getting a region from CONF for each project,
but most projects' sections contain a region value and it is easy to
specify its value instead of _get_region().
In addition, RestClient will become a tempest-lib class and it is needed
to separate CONF values from a RestClient class.
This patch moves _get_region() to NegativeRestClient and makes each client
specify its own CONF value.
Change-Id: Ib26badf64e7cddf4158e4720e193b3129e8fdb12
18 files changed