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/heat b/lib/heat
index 49ed533..3c20b2f 100644
--- a/lib/heat
+++ b/lib/heat
@@ -170,7 +170,7 @@
 function init_heat {
 
     # (re)create heat database
-    recreate_database heat utf8
+    recreate_database heat
 
     $HEAT_DIR/bin/heat-manage db_sync
     create_heat_cache_dir