Initialize DB on first use, not on import (multiprocessing problems)

Author: grafolean

dbutils.py

@@ -29,6 +29,9 @@
 @contextmanager
 def get_db_connection():
     global db_pool
+    if db_pool is None:
+        db_connect()
+
     try:
         conn = db_pool.getconn()
         conn.autocommit = True
@@ -72,8 +75,6 @@ def db_connect():
         db_pool = None
         log.error("DB connection failed")
 
-db_connect()
-
 # This class is only needed until we replace all db.cursor() calls with get_db_cursor()
 class ThinDBWrapper(object):
     @staticmethod