launch_command.py missing in MANIFEST.in

Change proposed: https://review.openstack.org/#/c/153352/

Reviewed: https://review.openstack.org/153352
Committed: https://git.openstack.org/cgit/openstack/sahara/commit/?id=a2cd638f119ad82a040060e14214269f46dadd29
Submitter: Jenkins
Branch: stable/juno

commit a2cd638f119ad82a040060e14214269f46dadd29
Author: Ethan Gafford <email address hidden>
Date: Thu Feb 5 14:22:41 2015 -0500

    Include launch_command.py in MANIFEST.in

    The file launch_command.py was missed in the MANIFEST.in for Juno,
    which results in a non-functional Spark cluster.

    See https://bugzilla.redhat.com/show_bug.cgi?id=1184522 for one
    expression of this bug.

    The change to fix this bug was rolled into this review:
    https://review.openstack.org/#/c/146659/13
    It is not appropriate for cherry-picking, as the change with
    which it was made is much larger, but nonetheless this issue does
    render Spark clusters inoperable in Juno. The change is approved
    in master. Please let me know if a more formal process of
    registering the bug and attempting to create an atomic commit is
    needed; it seemed to me that given the state of this issue,
    attempting to do so might only create a more tangled web, but I'm
    happy to do so if it is preferable.

    Closes-bug: #1419868
    Change-Id: I29a17eb3ae9f9a3b8c5412d0be1813cfeca99622