The role reads the OS_* variables set by devstack through openrc
for the specified user and project and exports them as
the os_env_vars fact. It is meant to be used as a porting aid
for the jobs of the non-unified *clients only.
This is useful to run functional tests against the generated
environment. A slightly less generic version of this role
is currently used by python-cinderclient and python-novaclient
(get-os-environment).
In order to make this more useful, call it from
devstack-tox-functional and derived jobs. The role
execution is disabled by default and it can be enabled
by setting openrc_enable_export: true.
Change-Id: I15f5a187dbc54c82e8f4a08b4bb58d56e0d66961
6fba3fdfa1