kernel: add NFS4 client support

kernel: add NFS4 client support

Adds NFS4 client support:
 1. Package kmod-fs-nfs is split into kmod-fs-nfs (nfs.ko) and
    kmod-fs-nfs-v3 (nfsv3.ko).
 2. A new package kmod-fs-nfs-v4 (nfsv4.ko) is created.
 3. Package kmod-fs-nfs-common-v4 is renamed to kmod-fs-nfs-rpcsec
    and includes additional module rpcsec_gss_krb5.ko.
    CONFIG_NFS_V4 goes into kmod-fs-nfs-v4, CONFIG_NFSD_V4 (NFS4
    server) is removed. Missing kernel module oid_registry.ko
    needed by auth_rpcgss.ko is added to the package.

A new package kmod-crypto-cts needed by rpcsec_gss_krb5.ko is
also created.

Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>
[add dependency to kmod-crypto-ecb in fs-nfs-common-rpcsec]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>