Set Tempest's service_available setting for congress
Set Tempest's service_available setting for congress

Tempest's service_available config option includes all the service
availability which is further used by tests to take decision of skip
or run the test.

For example, [service_available].congress is true then, congress test will run
or if [service_available].congress is false then, all congress related tests either
in telemetry tempest plugin or any other plugins will be skipped.

This commit add the setting of congress service[1] on congress devstack plugin.

Closes-Bug: #1743688
[1] http://git.openstack.org/cgit/openstack/congress-tempest-plugin/tree/congress_tempest_plugin/config.py#n24

Change-Id: I57de34d2b185b8e9838dd288d3673149391f0024

openstack/congress,openstack/congress