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/cinder b/lib/cinder
index c106424..4b98bd9 100644
--- a/lib/cinder
+++ b/lib/cinder
@@ -376,7 +376,7 @@
 
     if is_service_enabled $DATABASE_BACKENDS; then
         # (Re)create cinder database
-        recreate_database cinder utf8
+        recreate_database cinder
 
         # Migrate cinder database
         $CINDER_BIN_DIR/cinder-manage db sync