Disable NFS-Ganesha caching when using cephfs-nfs driver

[Giulio Fidente]

This is important to reduce the memory footprint of NFS-Ganesha, which runs along with other services such as Ceph MONs, MDSs, and OpenStack services in the controller node.

Also see https://bugzilla.redhat.com/show_bug.cgi?id=1567511

[Giulio Fidente (gfidente)]

Addressed in master by https://review.openstack.org/#/c/561575/

[Giulio Fidente (gfidente)]

In queens by https://review.openstack.org/#/c/566458/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/566458
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=21384bfe8d1eada5fe4075abdbdddd2e77285c47
Submitter: Zuul
Branch: stable/queens

commit 21384bfe8d1eada5fe4075abdbdddd2e77285c47
Author: Ramana Raja <email address hidden>
Date: Mon Apr 16 15:32:29 2018 +0530

    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.

    Closes-Bug: 1769431
    Change-Id: Ibbd2c80931014cffa4580111070a97ea6df3a430
    (cherry picked from commit 053be637daf0cee393c7ea85c9d95361b2ee3ac4)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-heat-templates 8.0.3 release.