This commit implements kuryr-daemon support when
KURYR_K8S_CONTAINERIZED_DEPLOYMENT=True. It's done by:
* CNI docker image installs Kuryr-Kubernetes pip package and adds
exectution of kuryr-daemon into entrypoint script.
* Hosts /proc and /var/run/openvswitch are mounted into the CNI
container.
* Code is changed to use /host_proc instead of /proc when in a container
(it's impossible to mount host's /proc into container's /proc).
Implements: blueprint cni-split-exec-daemon
Change-Id: I9155a2cba28f578cee129a4c40066209f7ab543d
18db649943