Add set microversion in base compute service client

Now Manager class will set the request microversion
on each service clients if they support microversion.

This commit provide a set method on base compute service client
so that Manager can set expected microversion on those.

As all compute service clients needs to provide support for
microversion, those will be derived from this base class.

Partially implements blueprint api-microversions-testing-support

Change-Id: I9d6fa9654da7c922d9436d541ab363e92127b3e3
2 files changed