nfs: capture attrs of create request in cs->stbuf for later use

when attrs coming in as part of create request contain modes other
than mode, they were getting discarded previously and a setattr
was getting performed on a 0-filled iatt structure. This would
result in EPERM at the access control translator as non-root users
cannot chown a file to uid 0.

Not seen with Linux NFS client as it (very likely) relies upon
auth-unix to set the ownership of the file or sends an explicit
setattr after the create.

Signed-off-by: Anand Avati <avati@gluster.com>
Signed-off-by: Vijay Bellur <vijay@dev.gluster.com>

BUG: 2553 (NFS file create with Mac client and UNCHECKED mode returns "Operation not permitted")
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2553

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