remove  test_service_enable_disable in nova V3 tests

additional patch for change Ib681b393944b37c720e7a245e8b19b5254d116fd:
this removes the test: test_service_enable_disable, due to race
condition. And there is a discussion in the mail list.
http://lists.openstack.org/pipermail/openstack-dev/2013-November/018867.html

Change-Id: I7d54a72b45cb31e483f6833a12453d1a5cecdf61
Closes-bug: #1257506
Add config options for enabled extensions

This commit adds a new set of config options to the feature_enabled
groups for a list of enabled extensions. These options are used to
specify whether all extensions are enabled or which subset is expected
to be enabled. This just sets up the initial framework for doing
this and converts the FlavorExtraSpecs tests to use it.

paritally implements bp config-cleanup

Change-Id: I6a5a9b16e62eb8a216334a0662c99f0dd0d16873
Updated from global requirements

Change-Id: Ia54c5fb8815a586a9686adc38f6a88967f7a099d
Merge "Add config options for enabled extensions"
Merge "remove  test_service_enable_disable in nova V3 tests"