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/sahara b/lib/sahara
index c902d38..8573ee8 100644
--- a/lib/sahara
+++ b/lib/sahara
@@ -143,7 +143,7 @@
         setup_colorized_logging $SAHARA_CONF_FILE DEFAULT
     fi
 
-    recreate_database sahara utf8
+    recreate_database sahara
     $SAHARA_BIN_DIR/sahara-db-manage --config-file $SAHARA_CONF_FILE upgrade head
 }