nfs: Introduce trusted-write and trusted-sync options

Introduces two new options:

1. nfs3.*.trusted-write: Forces UNSTABLE writes to return STABLE to NFS
clients to prevent the clients from sending a COMMIT. STABLE writes
are still handled in a sync manner and so are COMMITs if they're sent
at all.

2. nfs3.*.trusted-sync: Forces all WRITEs and COMMITs to return STABLE
return flags to NFS clients to avoid the overhead of STABLE writes, and
COMMITs that follow UNSTABLE writes. This includes the trusted-write
functionality. In addition to the trusted-write, it also writes
STABLE writes in an UNSTABLE manner.

Both violate the NFS protocol but allow better write perf in most
configurations. Use with caution.

Signed-off-by: Shehjar Tikoo <shehjart@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 924 (Slow NFS synchronous writes)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=924

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