mount/fuse: Refactored fuse_setattr.

If both truncate & setattr need to be sent from fuse_setattr,
they are now sent one after the other (setattr first, and then truncate)
instead of being sent parallelly. The earlier code that sent them parallelly
had a couple of problems:

1) A bug in the logic that would sometimes cause the setattr call
   to never return, making the application hang.

2) A possibility that truncate and setattr would race at the server/io-threads/posix
   end, thus returning the wrong stat structure to the application.

This patch also removes an unneccessary "can_fuse_return" call in
fuse_attr_cbk, which would cause a call to hang if STAT or FSTAT failed.

Signed-off-by: Vikas Gorur <vikas@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 146 (Add setattr FOP)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=146

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