list endpoints should return storage policy index

[clayg]

With storage policies in place object servers require the X-Backend-Storage-Policy-Index header to correctly operate on non-zero storage policy objects. The list endpoints middleware which exposes direct backend urls needs to be updated to include the storage policy index when returning the list of nodes.

I'm imaging a new endpoints v2 response that looks like:

    {
        "endpoints": [
            "http://127.0.0.1:6040/sdb4/645/AUTH_test/test/test",
            "http://127.0.0.1:6010/sdb1/645/AUTH_test/test/test",
            "http://127.0.0.1:6030/sdb3/645/AUTH_test/test/test"
        ],
        "storage_policy_index": "1"
    }

the trick is managing calls to /endpoints/ and directing them to /endpoints/v1 and /endpoints/v2

[Bill Huber (wbhuber)]

The fix is released in commit 216aaab6387cd4db63aeb51520e8c1b9c70e31a5