This patch ensures namespace handler does not depend on specific
functions implemented on the security group driver for the namespace
isolation. This way it will be possible to enable the namespace
handler (to create a different network per namespace) together with
the network policy that will perform the isolation between pods/svc
in a different way.
Partially Implements: blueprint k8s-network-policies
Closes-Bug: #1799496
Change-Id: Ied892e616075ce16fdc15ceb31219c100e011536
(cherry picked from commit 651da66af1)
00c991be36