Fix missing import statement bug.

Summary:Exception is raised because of missing import statment for ```jwlib```, facebook/infer#288.
Closes https://github.com/facebook/infer/pull/289
Closes #288

Reviewed By: jeremydubreil

Differential Revision: D2982163

Pulled By: jvillard

fb-gh-sync-id: dffb284
shipit-source-id: dffb284

infer/lib/python/inferlib/capture/mvn.py

@@ -10,6 +10,8 @@ import logging
 import re
 import util
 
+from inferlib import jwlib
+
 MODULE_NAME = __name__
 MODULE_DESCRIPTION = '''Run analysis of code built with a command like:
 mvn [options] [task]