stack.sh finished but db-ext-services doesn't work as expected

[Li Ma]

I run a flesh installation and stack.sh is finished successfully. However dragonflow doesn't work because db-ext-services failed.
In the log file, it says:

bash /opt/stack/dragonflow/devstack/df-ext-services.sh
/opt/stack/dragonflow/devstack/plugin.sh: line 40: /lib/neutron_plugins/ovs_base: No such file or directory
/opt/stack/dragonflow/devstack/plugin.sh: line 41: /lib/neutron_plugins/openvswitch_agent: No such file or directory
Starting OVS

[Li Ma (nick-ma-z)]

[[local|localrc]]

#OFFLINE=True
GIT_BASE="http://github.com"

Q_ENABLE_DRAGONFLOW_LOCAL_CONTROLLER=True

DATABASE_PASSWORD=password
RABBIT_PASSWORD=password
SERVICE_PASSWORD=password
SERVICE_TOKEN=password
ADMIN_PASSWORD=password

enable_plugin dragonflow http://git.openstack.org/openstack/dragonflow
enable_service df-etcd
enable_service df-etcd-server
enable_service df-controller
enable_service db-ext-services

disable_service n-net
enable_service q-svc
enable_service q-l3
enable_service q-dhcp
disable_service heat
disable_service tempest

disable_service q-agt

[OpenStack Infra (hudson-openstack)]

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