When using MidoNet as Neutron plugin, booting instance with security
group other than `default` will result in failure. This is because some
of the essential configuration options are missing from `nova.conf` on
Nova controller, namely `firewall_driver`, `libvirt_vif_driver`, and
`security_group_api`.
This commit will fix this problem by configuring those configuration
options in `nova.conf` on Nova controller.
Change-Id: Ibbaf6720bb27512a9d7dfe68d3258dd84ed17b0b
Signed-off-by: Ryo Tagami <rtagami@airstrip.jp>