[DNM] ceph-nfs: disable ganesha caching
[DNM] ceph-nfs: disable ganesha caching

When using ceph-ansible to setup Ganesha as CephFS's gateway,
disable Ganesha's caching so that Ganesha doesn't cache the
same information that libcephfs clients do.

Change-Id: Ibbd2c80931014cffa4580111070a97ea6df3a430

dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates