This commit introduces a new configuration option for
ceph csi driver to enable hostpath mounting of /etc/selinux
directory from the cluster node where csi plugin pods are
running, which inturn help the csi driver to specify
selinux-related mount options like context.
Ref# https://github.com/ceph/ceph-csi/issues/2295
The default value for this configuration is true and if cluster
nodes are running without selinux enabled, an admin can deploy
csi pods by specifying this option to `false` which skip the
host path mounting for the csi pods.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>