add dnsmasq-flags config option

[JuanJo Ciarlante]

neutron-gateway already has 'dnsmasq-flags' config, and we
should pair neutron-openvswitch's dhcp-agent config'ability
with it.

Use case: be able to preset the default dns resolvers for a
provider-network deployment that doesn't have neutron-gateway
service (ie it has enable-local-dhcp-and-metadata: True):
this is currently not possible, forcing a manual 'neutron
subnet-update ...' to each added subnet for proper dns
settings.

[Billy Olsen (billy-olsen)]

Marking against charm-neutron-openvswitch vs charms/+source/neutron-openvswitch.

[Billy Olsen (billy-olsen)]

I think this is best addressed by the internal-dns feature outlined in https://specs.openstack.org/openstack/charm-specs/specs/pike/approved/internal-dns.html leveraging the new dns-servers config option.

However, the ability to set dnsmasq-flags across charms that provide for the neutron-dhcp-agent (which runs dnsmasq) should be consistent. As such, this is a bug in that it is missing a function existing elsewhere.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/461922

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/461922
Committed: https://git.openstack.org/cgit/openstack/charm-neutron-openvswitch/commit/?id=9ce49952051d880a0bed9b578ed875a25c973c42
Submitter: Jenkins
Branch: master

commit 9ce49952051d880a0bed9b578ed875a25c973c42
Author: Billy Olsen <email address hidden>
Date: Tue May 2 15:36:12 2017 -0700

    Add dnsmasq-flags to charm-neutron-openvswitch

    Add a new option to provide the ability to specify flags in the
    dnsmasq.conf file. This allows users to configure the dnsmasq
    processes used by the neutron-dhcp-agent when local dhcp and
    metadata are enabled for provider networks.

    Change-Id: I2bab8a00322afb0f81986001c86f0ef4fc535651
    Closes-Bug: #1684231

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/17.02
Review: https://review.openstack.org/468471

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/468471
Committed: https://git.openstack.org/cgit/openstack/charm-neutron-openvswitch/commit/?id=919683af6a0f161828ac8ce70f15730238a79bde
Submitter: Jenkins
Branch: stable/17.02

commit 919683af6a0f161828ac8ce70f15730238a79bde
Author: Billy Olsen <email address hidden>
Date: Tue May 2 15:36:12 2017 -0700

    Add dnsmasq-flags to charm-neutron-openvswitch

    Add a new option to provide the ability to specify flags in the
    dnsmasq.conf file. This allows users to configure the dnsmasq
    processes used by the neutron-dhcp-agent when local dhcp and
    metadata are enabled for provider networks.

    Change-Id: I2bab8a00322afb0f81986001c86f0ef4fc535651
    Closes-Bug: #1684231
    (cherry picked from commit 9ce49952051d880a0bed9b578ed875a25c973c42)

[Billy Olsen (billy-olsen)]

This was released in revision 241 of the neutron-openvswitch charm