Enable pod security policies

Enable pod security policies

The intention with this change is to disable CAP_NET_RAW (which can be
a security vulnerability) for created Pods.

kubespray provides the podsecuritypolicy_enabled variable for enabling
privileged (for kube-system) and restricted (for everyone else)
policies.  Enabling this requires binding the KUD_ADDONs to the
privileged policy and specifying the security context correctly for
Pods running in the default namespace.

As of this change, the only difference between the privileged and
restricted security policies is the dropping of CAP_NET_RAW in the
restricted policy.  To use the default restricted policy provided with
kubespray, additional changes must be made to the Pods that are run in
the default namespace (such as runing as a non-root user, not
requesting privileged mode, etc.).

Issue-ID: MULTICLOUD-1256
Signed-off-by: Todd Malsbary <todd.malsbary@intel.com>
Change-Id: I7d6add122ad4046f9116ef03a249f5c9da1d7eec