Share service fails to start if endpoints unavailable

[Ryan Hefner]

When the Manila share service starts, it instantiates the Neutron network helper, which makes a call to the Neutron service. If the service is started and the Neutron service is unaccessible, the share service will fail to even start.

When attempting to integrate Manila into the TripleO installer, the service just sits dead on the controller.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/209594

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/209594
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=4f861423a069992511a82a305d8411b12a7ebb22
Submitter: Jenkins
Branch: master

commit 4f861423a069992511a82a305d8411b12a7ebb22
Author: Ryan Hefner <email address hidden>
Date: Mon Aug 24 14:45:54 2015 -0400

    Lazy Load Services

    When the Manila share service starts, it instantiates
    the Neutron network helper, which makes a call to the
    Neutron service. If the service is started and the
    Neutron service is unaccessible, the share service will
    fail to even start.

    This patch lazy loads those parameters so that they are
    only loaded when needed (and presumably when the Neutron
    service is up).

    Change-Id: I1857c0cb6fc41afd0d01916addc1fd216070ffd7
    Closes-Bug: #1481331