Enforce UTF-8 encoding when creating databases

We use InnoDB everywhere, so there should be no issues with long unicode
keys. Dropped charset parameter for recreate_database since it's not
needed anymore.

Change-Id: Ib768402a9337c918309030a92ab81da17269f4f6
diff --git a/lib/keystone b/lib/keystone
index 071dc90..fa6f346 100644
--- a/lib/keystone
+++ b/lib/keystone
@@ -448,7 +448,7 @@
     fi
 
     # (Re)create keystone database
-    recreate_database keystone utf8
+    recreate_database keystone
 
     # Initialize keystone database
     $KEYSTONE_DIR/bin/keystone-manage db_sync