Comment 2 for bug 1525499

Reviewed: https://review.openstack.org/257951
Committed: https://git.openstack.org/cgit/openstack/dragonflow/commit/?id=5d1f89824328d5aaa2a0ad4c15ecd61c93b1b46f
Submitter: Jenkins
Branch: master

commit 5d1f89824328d5aaa2a0ad4c15ecd61c93b1b46f
Author: Li Ma <email address hidden>
Date: Tue Dec 15 22:34:41 2015 +0800

    Fix df-ext-services.sh run under devstack

    Commit 421850636755a256e8750a7017a28ef072ebcbb4 includes
    devstack neutron scripts which triggers a dependency issue
    happens in df-ext-services.sh.

    df-ext-services.sh which doesn't run under devstack directory cannot
    locate $TOP_DIR which points to devstack directory in plugin.sh.

    In this patch, we dynamically locates and updates $TOP_DIR
    in df-ext-services.sh.

    Change-Id: I816f8157b4c1520707f6d8664b9390a9e3fed6fb
    Closes-Bug: #1525499