When the cloud is behind a proxy, podman needs to access the dockerhub
via proxy to pull the image, so the proxy settings need to be exported
to etcd systemd file as well. We're setting the heat-params as
environment file for k8s components already.
Besides, because CIDR of fixed subnet vary for different clusters,
so the subnet CIDR should be added into NO_PROXY list. Otherwise,
it will affect the communication between etcd members and also the
communication between k8s components.
Task: 39990
Story: 2007768
Change-Id: I4dba79e04abe38b9806e847348d3dd77ef96bee5
(cherry picked from commit b2e3f2346b)
e68f1d85f8