* Single universal ClientManager class was dropped in favor of
of individual in-context methods to create OS clients without
ClientManager restrictions.
* Environment class was renamed to ExecutionSession to avoid
common confusion with io.murano.Environment
* execution_session_local module was introduced to simplify
keep of per-execution session (per-deployment) data. This
is similar to thread-locals with the difference that there can
be many threads in single session.
* All OS-clients related code was migrated to keystone client
sessions and API v3 (except for GLARE and Mistral that doesn't
support sessions). This increases performance and solves
authentication problems that could be caused by token expiration
even with trusts enabled.
* [DEFAULT]/home_region setting was introduced instead of
[murano]/region_for_services to configure what region
should be used by the clients by default (where Murano API
resides). All client factories respect this setting.
Change-Id: If02c7e5d7d39574d0621e0e8dc27d1f501a31984
fc76b3b1b4