test: Check fstab handling for NFS mounts
test: Check fstab handling for NFS mounts

Add tests that ensure that Cockpit picks up NFS mounts from /etc/fstab,
and writes new and changed NFS mounts there.

moraleslazaro/cockpit,martinpitt/cockpit,cockpituous/cockpit,mvollmer/cockpit,deryni/cockpit,martinpitt/cockpit,garrett/cockpit,deryni/cockpit,moraleslazaro/cockpit,garrett/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpituous/cockpit,cockpituous/cockpit,cockpit-project/cockpit,deryni/cockpit,martinpitt/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,garrett/cockpit,deryni/cockpit,cockpituous/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,mvollmer/cockpit,cockpituous/cockpit,garrett/cockpit,deryni/cockpit,mvollmer/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,deryni/cockpit,cockpituous/cockpit