Correctly set the L3 service plugin for ML2

ML2 uses a service plugin for L3. This patch to devstack
correctly sets this by setting or updating the variable
Q_SERVICE_PLUGIN_CLASSES, which makes ML2 compatible when
running with other service plugins (e.g. LBaaS and VPN).

Fixes bug 1231622

Change-Id: I0ce1f5a42bd052995135ffac1ee5ef382d69789e
Expose all versions of Ironic API

In the observable future new versions of the Ironic
API will appear. That's why it's reasonable to expose
the endpoint that will provide access to all versions
of the API.

Closes-Bug: #1229780
Change-Id: I4ec2b45688da3fa6c0d43e8be60885774cfbffd6
Normalise RECLONE flag to True Or False.

RECLONE flag now uses function trueorfalse for flag handling.
Added more flag cases to normalisation function trueorfalse.

Fixes bug #1200382

Change-Id: I0738537c87634281c6a92fa93b7f84a6b0dad497
vSphere hypervisor plugin

Convert vSphere hypervisor configuration in Nova to the new plugin setup.

Change-Id: Ibf6f5918e6a8d8a7b7784dac832d806e993cff8f
Merge "Expose all versions of Ironic API"
Merge "vSphere hypervisor plugin"
Merge "Normalise RECLONE flag to True Or False."
Merge "Correctly set the L3 service plugin for ML2"
Merge branch 'master' of github.com:openstack-dev/devstack