Big Switch: Consistency watchdog should stop on polling interval of 0

[Kevin Benton]

If the user sets the consistency watchdog polling interval to 0, it will poll as fast as possible instead of disabling the watchdog as expected.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/101324

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/101324
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=60c1b9e227fdfcae8e3660ffbd5062eb6a4abb33
Submitter: Jenkins
Branch: master

commit 60c1b9e227fdfcae8e3660ffbd5062eb6a4abb33
Author: Kevin Benton <email address hidden>
Date: Wed Jun 18 14:08:17 2014 -0700

    Big Switch: Stop watchdog on interval of 0

    Corrects the behavior of the watchdog process
    to exit if the user configures the polling interval
    to be 0.

    Also adds missing documentation to sample config.

    Change-Id: I17b566867c21f42985cc4662f56d32db690f471f
    Closes-Bug: #1332334