This change adds the dnsmasq.log for the ironic-dnsmasq container and
also enables more verbose logging when debug logging enabled.
This can be triggered globbaly via 'openstack_logging_debug' or per
service via 'ironic_logging_debug' or 'neutron_logging_debug'.

Change-Id: I0e6b089beb88827effbcc365625eb2df902f5470
Signed-off-by: Maksim Malchuk <maksim.malchuk@gmail.com>