Fix another_role variable for swift

An error occurs because ANOTHER_ROLE variable in lib/swift is not set.
This patch gets and sets the value to another_role variable.

Change-Id: I9d67ce243eb6bb42ed7e3522ef816295847d48fa
Closes-Bug: #1363884
diff --git a/lib/keystone b/lib/keystone
index 42acd50..c568b2a 100644
--- a/lib/keystone
+++ b/lib/keystone
@@ -357,9 +357,8 @@
     # The Member role is used by Horizon and Swift so we need to keep it:
     local member_role=$(get_or_create_role "Member")
 
-    # ANOTHER_ROLE demonstrates that an arbitrary role may be created and used
+    # another_role demonstrates that an arbitrary role may be created and used
     # TODO(sleepsonthefloor): show how this can be used for rbac in the future!
-
     local another_role=$(get_or_create_role "anotherrole")
 
     # invisible tenant - admin can't see this one