NFS: remount with security change should return EINVAL
NFS: remount with security change should return EINVAL

A remount that alters security flavors can appear to succeed when it should
instead return -EINVAL.  Check to see if the current security flavor exists
within the flavors specified in the remount options, and if not fail the
remount.

Signed-off-by: Benjamin Coddington <8448cf767486b00c07603be762726b9248f4b321@redhat.com>
Signed-off-by: Trond Myklebust <cc958843532c615cbd4920e868f78c7985331a5a@primarydata.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs