Restart memcached after clean-up-token --purge-all

Bug: https://bugs.launchpad.net/gluster-swift/+bug/1269444

Recommended way is to flush the cached tokens from memcached after
gswauth-clean-up-token. As currently there is no way to flush only those
tokens from memcached. So a debug message recommending restart of the
memcached. A quick fix. Bigger fix would come in later.

Older cached tokens should be flushed/invalidated to let access path work
correctly with valid and new tokens.

Change-Id: Ic7a820eb3c60bac4829d5c5230cb3a5241b77957
Signed-off-by: Chetan Risbud <crisbud@redhat.com>
Reviewed-on: http://review.gluster.org/7168
Reviewed-by: Prashanth Pai <ppai@redhat.com>
Tested-by: Prashanth Pai <ppai@redhat.com>
Reviewed-by: pushpesh sharma <psharma@redhat.com>
Tested-by: pushpesh sharma <psharma@redhat.com>
PUT of a Directory failed

PUT of a directory fails with gluster-swift when there exists
object of a same name. This is because the objects and directories are placed on
the glusterfs. And hence the filesystem semantics are applicable there.

Exceptions raised in such situation are needed to be handled and reported
correctly back to proxy-server with HTTPConflict as a error code. Although
swift still continues to choose 503 as the best respose in such cases. No
tracebacks reported.

Fix covers the case when there exists a directory and object of the same
name is PUT.

Code changes fixes both the failure cases mentioned in the bug.

Examples of failing PUT requests:
1) curl -v  -X PUT http://127.0.0.1:8080/v1/AUTH_test/c1/dir1/obj2/anotherobject
-d'asdasdsadA'
-- obj2 was already an object.

2)curl -v -H 'Content-Length: 0' -H 'Content-Type: application/directory' -X PUT
http://127.0.0.1:8080/v1/AUTH_test/c1/obj1
-- obj1 was already and object

Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1071021

Change-Id: Id3042d920e3f99e740d4042ef5907ac8c59e04db
Signed-off-by: Chetan Risbud <crisbud@redhat.com>
Reviewed-on: http://review.gluster.org/7181
Reviewed-by: Prashanth Pai <ppai@redhat.com>
Tested-by: Prashanth Pai <ppai@redhat.com>
Sync with OpenStack Swift v1.13.0

Also, bumped version of gluster-swift to v1.13.0

Change-Id: I797dc704c9523540cba847b1e8ff3da97b79630c
Signed-off-by: Prashanth Pai <ppai@redhat.com>
Reviewed-on: http://review.gluster.org/7229
Reviewed-by: Chetan Risbud <crisbud@redhat.com>
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>