Apply SLES11 specific DNSMASQ class in dhcp-agent
Apply SLES11 specific DNSMASQ class in dhcp-agent

SLES11 is running old version of dnsmasq which is not supporting tag feature.
We have special quantum class prepared which solves this problem.

wenhuizhang/openstack-quickstart,sayalilunkad/openstack-quickstart,sjamgade/openstack-quickstart,hayderimran7/openstack-quickstart,toabctl/openstack-quickstart,SUSE-Cloud/openstack-quickstart