NFS: Combine nfs_idmap_{init|quit}() and nfs_idmap_{init|quit}_keyring()
NFS: Combine nfs_idmap_{init|quit}() and nfs_idmap_{init|quit}_keyring()

The idmap_init() and idmap_quit() functions only exist to call the
_keyring() version.  Let's just call the keyring() functions directly.

Signed-off-by: Anna Schumaker <5381043123508d4eed62c465c7c46f2f193a2767@Netapp.com>
Signed-off-by: Trond Myklebust <cc958843532c615cbd4920e868f78c7985331a5a@primarydata.com>

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