features/trash initial cleanup commit

* support O_TRUNC flag in open (call comes to FS as 'truncate'
  or 'ftruncate' fop)
* option to provide 'eliminate-pattern' so those files matching
  won't be kept in trash. Eg:
      option eliminate-pattern *.out|*~
* option to give 'maximum' file size to keep in trash, ie, when a
  20GB file is deleted, it won't be kept in trash if max file size
  given is 1GB. Eg:
      option max-trashable-file-size 1GB

These particular features are developped as a part of college project
by following team:

Sunil bhagwath <sunilkbhagwat@gmail.com>
Yashaswi Kumar <yashaswikumar@gmail.com>
Rashmi B K     <rashmibk17@gmail.com>
Sandeep M      <astrophyster@gmail.com>

Submitting after minor coding standard edits and memoryleak fixes.

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 142 (enhance features/trash  translator so it can work on client side too..)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=142

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