Description of problem:
I tried verifying that I get a 507 returned, but instead I get a 503.

Setup:

    fill up /mnt/gluster-storage/test/container
    Create a 100MG file called 100m.img
    curl -v -X PUT -H 'X-Auth-Token: <you need to get your own token>' -T 100m.img http://127.0.0.1:8080/v1/AUTH_test/myfile2/a
    About to connect() to 127.0.0.1 port 8080 (#0)
    Trying 127.0.0.1...
    Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
    > PUT /v1/AUTH_test/myfile2/a HTTP/1.1
    > User-Agent: curl/7.29.0
    > Host: 127.0.0.1:8080
    > Accept: */*
    > X-Auth-Token: AUTH_tk42adf371bba74dd7a58838a77abed512
    > Content-Length: 104857600
    > Expect: 100-continue
    >
    < HTTP/1.1 100 Continue
    We are completely uploaded and fine
    < HTTP/1.1 503 Internal Server Error
    < Last-Modified: Tue, 06 Aug 2013 04:02:30 GMT
    < Content-Length: 118
    < Content-Type: text/html; charset=UTF-8
    < Date: Tue, 06 Aug 2013 04:02:30 GMT
    < 

I suggest adding a test in test/unit/proxy/test_proxy.py which mocks the open call, then sends the python command over to the server. In response it should expect a 507.

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