Bug 1411776 - [mozdebug] Fix 'module has no attribute' error when using --debugger, r=jmaher

This fixes a regression from bug 1397849.

MozReview-Commit-ID: 4JrnkYVwTo

--HG--
extra : rebase_source : 70d37791a35fd2f6877ad1556ca9cd92804f52e0

testing/mozbase/mozdebug/mozdebug/__init__.py

@@ -29,4 +29,4 @@ debugger-specific arguments:
 """
 from __future__ import absolute_import
 
-from mozdebug import *
+from .mozdebug import *