cluster/afr: entry self-heal: Set parent directory's attributes using a new frame.

There was a race condition in assuming that afr_sh_entry_impunge_parent_setattr_cbk will
   always return before impunge_xattrop_cbk and impunge_setattr_cbk.

   This patch fixes two additional problems:

1) Building the parent_loc from impunge_local->loc after STACK_WIND to
   impunge_xattrop_cbk has happened. In a simple afr-posix configuration
   the stack will have been destroyed by the time building of parent_loc is
   attempted.

2) parent_loc built in impunge_newfile_cbk was not being loc_wipe'd.

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

BUG: 137 (Parent directory mtime not reset after a create in self-heal)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=137

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