NFSv4: cleanup idmapper functions to take an nfs_server argument

...instead of the nfs_client.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --cc fs/nfs/idmap.c
Simple merge

diff --cc fs/nfs/nfs4xdr.c
Simple merge

diff --cc include/linux/nfs_idmap.h
Simple merge