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/databases/postgresql b/lib/databases/postgresql
index 76491c4..ad8cdc7 100644
--- a/lib/databases/postgresql
+++ b/lib/databases/postgresql
@@ -37,10 +37,9 @@
 
 function recreate_database_postgresql {
     local db=$1
-    local charset=$2
     # Avoid unsightly error when calling dropdb when the database doesn't exist
     psql -h$DATABASE_HOST -U$DATABASE_USER -dtemplate1 -c "DROP DATABASE IF EXISTS $db"
-    createdb -h $DATABASE_HOST -U$DATABASE_USER -l C -T template0 -E $charset $db
+    createdb -h $DATABASE_HOST -U$DATABASE_USER -l C -T template0 -E utf8 $db
 }
 
 function configure_database_postgresql {