LBaaS: haproxy driver should respect vip/pool admin state

[Oleg Bondarev]

On vip/pool update when admin_state_up becomes False haproxy driver should reflect it in the config.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/82749

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/142471

[OpenStack Infra (hudson-openstack)]

Change abandoned by Oleg Bondarev (<email address hidden>) on branch: master
Review: https://review.openstack.org/82749
Reason: Was proposed for neutron-lbaas: https://review.openstack.org/#/c/142471/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/142471
Committed: https://git.openstack.org/cgit/openstack/neutron-lbaas/commit/?id=a627100d510d58d558982d2d5f5bebbe35634b18
Submitter: Jenkins
Branch: master

commit a627100d510d58d558982d2d5f5bebbe35634b18
Author: Oleg Bondarev <email address hidden>
Date: Wed Dec 17 19:26:51 2014 +0400

    Haproxy driver should respect vip/pool admin state

    On vip/pool update when admin_state_up becomes False
    haproxy driver should reflect it in the config.
    Currently there may be only one vip in the config and
    if it is disabled, haproxy process fails to restart with
    "[ALERT] 084/045122 (11407) : [haproxy.main()] No enabled
    listener found (check the <listen> keywords) ! Exiting.",
    and continues running and balancing with old config -
    so for this case we need to undeploy loadbalancer.
    The patch also moves namespace deletion to delete_pool()
    as there is no need to delete/recreate namespace each time
    the vip is removed/added or disabled/enabled

    Closes-Bug: #1155092
    Closes-Bug: #1297142
    Change-Id: I11e2bd3185328ba47ba1aaede932e3114263bed8