Merge PR #38913 into master

* refs/pull/38913/head:
	qa/tasks/cephfs/nfs: Add tests for updating fs exports
	mgr/volumes/nfs: Handle rook restart error
	doc/cephfs/nfs: Add about update export interface
	mgr/volumes/nfs: Add command to update cephfs exports
	pybind/volumes/nfs: set mds caps according to user specified access type
	mgr/volumes/module: Remove unused json module

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>