Disable caching done by ganesha
Disable caching done by ganesha

Disable caching done by ganesha when ganesha
is used as CephFS's gateway (manila's usecase)

This is the recommended Ganesha setting as libcephfs
already caches information. Doing so helps avoid
cache incoherency issues.

Change-Id: Iacd575ac61b39ab9dcf8814514b5e3267570a17f
Closes-Bug: #1898950

openstack/devstack-plugin-ceph