Handle non-blocking renames during object PUTs

DiskFile._finalize_put() will now retry renames if it fails with EBUSY
or ESTALE. This is required because for a brief period of time, rename
operation in glusterfs was non-blocking.
Reference: http://review.gluster.org/#/c/13366/

This change also does the following:
* Updates comments to add clarity for operations done and exceptions
  caught in DiskFile.create()
* Handles race between container existance check (memcache) and
  object creation a little more gracefully by logging what really
  happened.

Change-Id: I89777be19eef73826b5f84deec0777173b62935f
Signed-off-by: Prashanth Pai <ppai@redhat.com>
Reviewed-on: http://review.gluster.org/14118
Reviewed-by: Thiago da Silva <thiago@redhat.com>
Tested-by: Thiago da Silva <thiago@redhat.com>

0 files changed, 0 insertions, 0 deletions