Introduce NamespaceSate class

Change-Id: Ice600aab70667d869c2c983a902464a512cf4897
Revert a typo

Change-Id: I56da77bfb587ec38512e43538afd23dac688434f
Add needed netns command args, ip/mac

Change-Id: Id421a8770fe0643ee94aa3efb48752855ba82a73
Add a signal manager

Change-Id: Idf0bcc1a453c681a6be4c3e01a8b18d8cf9a30e2
Improves the agent signal manager a bit

Change-Id: Ie737c690601f013c0632673e07badbc9d037e733
Fix signal agent, add ipam graph walk

UT has to be fixed, and improved
IPAM dependency management has to be fixed

Change-Id: I87b0e0e3404361a35df553700501419925276de5
Revert a change in UT

Change-Id: Ifdff811c881adcfb0895128ee97de8d2a65e82b4
Merge branch 'service_instance' of github.com:safchain/contrail-controller into safchain-service_instance
Merge branch 'safchain-service_instance' into service_instance