Define v3 services_client as library

Migrate v3 API services_client to tempest.lib

Partially implements blueprint consistent-service-method-names

Change-Id: Iadf53aa16425ffd286f0c4bfd760d5b244494a2d
diff --git a/releasenotes/notes/add-new-identity-clients-as-library-3e6559d4bff3e776.yaml b/releasenotes/notes/add-new-identity-clients-as-library-3e6559d4bff3e776.yaml
index da0e85b..9feb3c3 100644
--- a/releasenotes/notes/add-new-identity-clients-as-library-3e6559d4bff3e776.yaml
+++ b/releasenotes/notes/add-new-identity-clients-as-library-3e6559d4bff3e776.yaml
@@ -6,3 +6,4 @@
     any maintenance changes.
 
       * regions_client(v3)
+      * services_client(v3)