nfsd4: replace oo_confirmed by flag bit

I want at least one more bit here.  So, let's haul out the caps lock key
and add a flags field.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --cc fs/nfsd/nfs4proc.c
Simple merge

diff --cc fs/nfsd/nfs4state.c
Simple merge

diff --cc fs/nfsd/state.h
Simple merge