MFC: 220152

MFC: 220152
  This patch fixes the Experimental NFS client to properly deal with 32 bit or
  64 bit fileid's in NFSv2 and NFSv3. Without this fix, invalid casting (and sign
  extension) was creating problems for any fileid greater than 2^31.

  We discovered this because we have test clusters with more than 2 billion
  allocated files and 64-bit ino_t's (and friend structures).

Reviewed by:    rmacklem
Approved by:    zml (mentor)

git-svn-id: svn://svn.freebsd.org/base/stable/8@220607 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f