nfs3: Special-case the lookup for parent dir of root

When a lookup request comes in for (rootfh, ".."), we need to handle
it in a way that returns the attributes and handle of the root dir.
Not doing so crashes nfsx because the inode table is not able to
find a inode for the root's parent. This inode was being referenced in
nfs3_lookup_parentdir_resume when filling a loc for the lookup fop.

For the record, such a lookup request is sent by vmkernel.

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

BUG: 942 (NFS crashes as a vmware ESX data store)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=942

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