Should enable ceilometer-api service explicitly in devstack config

[Eric Xie]

Description
===========
I setup one devstack environment with devstack/local.conf.controller.
But it can not populate endpoints for ceilometer.
The service `ceilometer-api` MUST be enabled explicitly.

Steps to reproduce
==================
* Setup devstack environment with devstack/local.conf.controller.

Expected result
===============
`openstack endpoint list` can get endpoints for ceilometer-api.

Actual result
=============
There are not any endpoints for ceilometer-api.

Environment
===========
# ENV
devstack

# version
- devstack:
$ git log
commit cdf79c96203b00c1f2d03770c28ba29fd78a1e3e
Merge: 0fddb35 88b8409
Author: Jenkins <email address hidden>
Date: Fri Feb 24 00:59:06 2017 +0000

    Merge "mysql: set default sql_mode to TRADITIONAL"

- watcher:
$ git log
commit 9e7f7f54f335ea8e7f69eeec5ea5054f696fa155
Author: ericxiett <[e-mail]>
Date: Thu Feb 23 16:40:00 2017 +0800

    Fix some typos in vm_workload_consolidation.py.

    Change-Id: I1da1ed89f3e278af05d227d5011c8984218c026f

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/437901
Committed: https://git.openstack.org/cgit/openstack/watcher/commit/?id=68e4bc4d87fbbe9693a242c717dc0646ae59dd45
Submitter: Jenkins
Branch: master

commit 68e4bc4d87fbbe9693a242c717dc0646ae59dd45
Author: ericxiett <[e-mail]>
Date: Fri Feb 24 21:40:19 2017 +0800

    Fix no endpoints of ceilometer in devstack environment setup.

    There are not any endpoints for `ceilometer` with devstack/
    local.conf.controller. The service `ceilometer-api` should
    be enabled explicitly.

    Change-Id: I2218a98182001bef65fbc17ae305cfadf341930e
    Closes-Bug: #1667678

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/watcher 1.1.0 release.