Add scratch directory for NFS upcall state storage

Add scratch directory for NFS upcall state storage

When the /var/lib/nfs/v4recovery directory is not present, NFSD cannot
record the upcall state and cannot end the 90-second grace period on
startup.  This is true even when NFS4 is not being served according to
nfsstat.

More details and discussion here:
https://lkml.org/lkml/2012/6/11/206

(From OE-Core rev: c7cb5cb92770615ffd302f737d0fef3f2300c321)

Signed-off-by: Rich Dubielzig <rich.dubielzig@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>