Incorrect stack trace frames in MuranoPL for native Python frames

[Stan Lagun]

When MuranoPL stack trace contains mix of MuranoPL and Python frames Python frames are printed without file name (instead <unknown> is written) and point to one line below correct position

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/100640

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/100640
Committed: https://git.openstack.org/cgit/stackforge/murano/commit/?id=705a0f583811077410f3089e4a23bde0b2d577b4
Submitter: Jenkins
Branch: master

commit 705a0f583811077410f3089e4a23bde0b2d577b4
Author: Stan Lagun <email address hidden>
Date: Tue Jun 17 22:26:57 2014 +0400

    Fixed incorrect information on Python frames in MuranoPL stack traces

    Python frames in mixed stack traces were missing file name and pointed to a line
    below correct position

    Change-Id: I335292f40b3b6ea3dbca80b84f1d8dbed9a6581d
    Fixes: bug #1331113