Comment 13 for bug 1650611

Reviewed: https://review.openstack.org/423206
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=21963618ca7accfe0b5d3389ee15426d5032a2ac
Submitter: Jenkins
Branch: stable/mitaka

commit 21963618ca7accfe0b5d3389ee15426d5032a2ac
Author: Bertrand Lallau <email address hidden>
Date: Tue Dec 20 10:53:41 2016 +0100

    DHCP: enhance DHCPAgent startup procedure

    During DhcpAgent startup procedure all the following networks
    initialization is actually perform twice:
     * Killing old dnsmasq processes
     * set and configure all TAP interfaces
     * building all Dnsmasq config files (lease and host files)
     * launching dnsmasq processes
    What is done during the second iteration is just clean and redo
    exactly the same another time! This is really inefficient and
    increase dramatically DHCP startup time (near twice than needed).

    Initialization process 'sync_state' method is called twice:
     * one time during init_host()
     * another time during _report_state()

    sync_state() call must stay in init_host() due to bug #1420042.

    sync_state() is always called during startup in init_host()
    and will be periodically called by periodic_resync()
    to do reconciliation.
    Hence it can safely be removed from the run() method.

    Change-Id: Id6433598d5c833d2e86be605089d42feee57c257
    Closes-bug: #1651368
    Closes-Bug: #1650611
    (cherry picked from commit f15851b98974dc16606da195cf3ecee577cd0ef8)
    (cherry picked from commit ae0a31d8b0c449031432117ac33c1e5bdf9d5957)