L2 Gateway (L2GW) is an API framework for OpenStack that offers bridging
two or more networks together to make them look at a single broadcast
domain. This patch implements the l2gw agent which is one of the backend
of the l2 gateway service plugin.
Change-Id: I1ae8132ceff9410be7bd82caddf0d14251e720bf
Depends-On: If1501c153b1b170b9550cb7e5a23be463fba1fe9
Partially-Implements: blueprint l2gw-service-integration
Signed-off-by: Peng Liu <pliu@redhat.com>