Move role_assignments_client to tempest lib
This patch adds unit tests for the role_assignments_client and also
moves it to the lib.
Additionally, the method is refactored to be generic and handle the
full set of the role_assignments API parameters.
Change-Id: I1452d4f7be927f87f180badee377afa116d55ed6
diff --git a/releasenotes/notes/add-role-assignments-client-as-a-library-d34b4fdf376984ad.yaml b/releasenotes/notes/add-role-assignments-client-as-a-library-d34b4fdf376984ad.yaml
new file mode 100644
index 0000000..a1edcc5
--- /dev/null
+++ b/releasenotes/notes/add-role-assignments-client-as-a-library-d34b4fdf376984ad.yaml
@@ -0,0 +1,6 @@
+---
+features:
+ - Define the identity service role_assignments_client as a library.
+ Add role_assignments_client to the library interface so the other
+ projects can use this module as a stable library without any
+ maintenance changes.