Description of problem:

A data storage leak occurs in glance when a checksum is provided while uploading an image to glance and the client process uploading the image prematurely dies.  This results in a data on the file system, but no reference to that data in the registry.

Steps to Reproduce:
1. begin an upload of an image with the md5sum
2. terminate the client immediately
3. run 'glance index' and note that a new image has not appeared
4. run ls on the file system which is backing glance and notice that orphaned data is there

Actual results:


$ ls -l /gluster/glance/images/
total 0

$ glance index
ID                                   Name                           Disk Format          Container Format     Size          
------------------------------------ ------------------------------ -------------------- -------------------- --------------

$ glance  image-create  --name testit --container-format bare --disk-format qcow2 --is-public true --file f16-x86_64-openstack-sda.qcow2 --size 213581824 --checksum 755122332caeb9f661d5c978adb8b45f
^CTraceback (most recent call last):
  File "/usr/bin/glance", line 9, in <module>
    load_entry_point('python-glanceclient==0.5.1', 'console_scripts', 'glance')()
  File "/usr/lib/python2.6/site-packages/glanceclient/shell.py", line 432, in main
    OpenStackImagesShell().main(sys.argv[1:])
  File "/usr/lib/python2.6/site-packages/glanceclient/shell.py", line 403, in main
    args.func(client, args)
  File "/usr/lib/python2.6/site-packages/glanceclient/v1/shell.py", line 160, in do_image_create
    image = gc.images.create(**fields)
  File "/usr/lib/python2.6/site-packages/glanceclient/v1/images.py", line 212, in create
    'POST', '/v1/images', headers=hdrs, body=image_data)
  File "/usr/lib/python2.6/site-packages/glanceclient/common/http.py", line 192, in raw_request
    return self._http_request(url, method, **kwargs)
  File "/usr/lib/python2.6/site-packages/glanceclient/common/http.py", line 137, in _http_request
    conn.request(method, url, **kwargs)
  File "/usr/lib64/python2.6/httplib.py", line 914, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib64/python2.6/httplib.py", line 954, in _send_request
    self.send(body)
  File "/usr/lib64/python2.6/httplib.py", line 756, in send
    self.sock.sendall(data)
  File "<string>", line 1, in sendall
KeyboardInterrupt

$ glance index
ID                                   Name                           Disk Format          Container Format     Size          
------------------------------------ ------------------------------ -------------------- -------------------- --------------

$ ls -l /gluster/glance/images/
total 103208
-rw-r-----. 1 glance glance 105684992 Dec 18 11:02 8d64fb62-67c5-4cbd-b109-123656d70903



Expected results:

The service should either report the image as existing but corrupt, giving the user a chance to clean it.  Or it should automatically deleted when it is detected as a failed upload.