Fix the new NFS client so that it handles the "nfs_args" value in mnt_optnew. This is needed so that the old mount(2) syscall works and that is needed so that amd(8) works. The code was basically just cribbed from sys/nfsclient/nfs_vfsops.c with minor changes. This patch is mainly to fix the new NFS client so that amd(8) works with it. Thanks go to Craig Rodrigues for helping with this.
Fix the new NFS client so that it handles the "nfs_args" value
in mnt_optnew. This is needed so that the old mount(2) syscall
works and that is needed so that amd(8) works. The code was
basically just cribbed from sys/nfsclient/nfs_vfsops.c with minor
changes. This patch is mainly to fix the new NFS client so that
amd(8) works with it. Thanks go to Craig Rodrigues for helping with
this.

Tested by:	Craig Rodrigues (for amd)
MFC after:	2 weeks

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