Example local.conf doesn't use newer plugin system

[Rob Cresswell]

The local_conf.rst uses an old configuration:

# enable Sahara (data-processing) Service
enable_service sahara

# enable Trove (database) Service
enable_service trove tr-api tr-tmgr tr-cond

This should now use the enable_plugin functions.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/200080

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/200080
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=9d15f0c4ede291b65f398b94673deab1ac0bb660
Submitter: Jenkins
Branch: master

commit 9d15f0c4ede291b65f398b94673deab1ac0bb660
Author: Rob Cresswell <email address hidden>
Date: Thu Jul 9 14:35:27 2015 +0100

    Update example local_conf

    This patch updates the example local_conf to use devstacks plugin
    system. Also some minor formatting changes.

    Change-Id: Idcfa7cbadbbbfbf9e7d6977a6320b68c9020a83c
    Closes-Bug: 1473073