Return a proper boolean True instead of a 'True' string

The type here is important, returning anything other than a boolean
has unintended consequences such as breaking Ansible callbacks because
they are expecting the "changed" field to be nothing other than a bool
by contract.

Change-Id: Ia9b4a749f64adae8969fd9ad66304d013013e056

roles/test-matrix/library/test_matrix.py

@@ -172,7 +172,7 @@ def main():
     LOG.debug("Services: %s " % services)
 
     if opts.ansible:
-        ansible_module.exit_json(changed='True', services=services)
+        ansible_module.exit_json(changed=True, services=services)
     else:
         if opts.mode == "services":
             print(",".join(services))