Comment 7 for bug 1423813

Also in addition if one wants recursion disabled, contrail-named-base.conf can be updated and named restarted.

commit 0ceda0a025d694f69c95f02363311a30dc10c1da
Author: Nipa Kumar <email address hidden>
Date: Tue Aug 16 17:16:38 2016 -0700

    Support dynamic configuration update of named

    An additional file contrail-named-base.conf will contain the base named configurtion
    such as options stanza, key stanza, controls stanza and logging stanza.

    All configs generated due to vdns configuration resulting in view stanza will be written
    to contrail-named.conf

    Before sending "reconfig" command to named, both the files will be merged
    into contrail-named.conf

    The above gives flexibility to user to update and apply changes without restarting
    the dns daemon which generated the contrail-named.conf

    An additional helper script(applynamedconfig.py) will merge the files and apply the
    config(contrail-named-base.conf) to named daemon.

    Change-Id: If6089189a1104f648d8d7d3f638c58f9883deb50
    Closes-Bug:1605341