BBHandler: remove bb.fetch referrence

BBHandler.py no longer use bb.fetch, so remove its import statement

Signed-off-by: Yu Ke <ke.yu@intel.com>

bitbake/lib/bb/parse/parse_py/BBHandler.py

@@ -28,7 +28,7 @@
 from __future__ import absolute_import
 import re, bb, os
 import logging
-import bb.fetch, bb.build, bb.utils
+import bb.build, bb.utils
 from bb import data
 
 from . import ConfHandler