Implement root reset functionality for Couchbase

[Khyati Sheth]

Couchbase currently does not support trove api call 'trove root-enable'

Add support for this api call for Couchbase.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/81640

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/81640
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=d64a3cbaab5bc98cff4b4ab90a5eabb74d111e34
Submitter: Jenkins
Branch: master

commit d64a3cbaab5bc98cff4b4ab90a5eabb74d111e34
Author: Khyati Sheth <email address hidden>
Date: Wed Mar 19 14:23:16 2014 -0700

    Add support for 'trove root-enable' in Couchbase

    Currently, trove api call 'root-enable' is not implemented by Couchbase
    guest agent. This fix adds the required support for the api call.

    Root-enable api call is being handled by the root controller in mysql
    extensions module. The controller makes a sync call to the guestagent to
    enable the root. The guest agent handles the actual implementation. This
    being true, the api call should be generic for datastores and not a
    part of mysql extension module. If a particular datastore does not
    support root-enable, the guest agent returns an appropriate message. The
    abstractions in the extension module are not clear and blueprint should
    be filed to generalize the extension module.

    Closes-Bug: #1294821

    Change-Id: I3f098032333cda70f4181e5688514cbda6730a45