Setup user and endpoints for Savanna

* create savanna user with admin role for auth token checks
* create service data_processing
* create savanna endpoint
* use savanna user for auth token checks

It's needed for running tempest tests.

Change-Id: Iff26960746e36012c275f43c0de0dedcaebc8b0a
diff --git a/extras.d/70-savanna.sh b/extras.d/70-savanna.sh
index f6881cc..6bbe113 100644
--- a/extras.d/70-savanna.sh
+++ b/extras.d/70-savanna.sh
@@ -14,6 +14,7 @@
     elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
         echo_summary "Configuring Savanna"
         configure_savanna
+        create_savanna_accounts
         if is_service_enabled horizon; then
             configure_savanna_dashboard
         fi