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Astakos' Authenticate Api Method has deprecated the `usage' request
parameter. Remove it from AstakosClient.

Rename 'PITHOS_AUTHENTICATION_URL' setting to 'ASTAKOS_URL'. Also remove
'PITHOS_AUTHENTICATION_USERS' from docs (it was removed from code in
commit 8df4fae).

Modify 'ASTAKOS_URL' to point to the node hosting the Astakos service
instead of im endpoint, i.e. rename from
'accounts.example.org/im/authenticate' to 'accounts.example.org'.

Use the python-objpool package for pooling resources as object, instead
of the pooling code that existed in snf-common ('synnefo.lib.pool')

Refs #3524

Refs #3492

- Introduce a generic PooledObject class to act both
  as a context manager for getting and putting back
  an object from a pool.

- Implement a class PooledHTTPConnection(PooledObject)
  as a sublcass of the one in (1)

- Eliminate httplib.HTTPConnection patching of close().
  Eliminate put/get_http_connection.
  The httplib.HTTPConnection object is no longer released
  back to the pool via a method on it.
  One must explicitly put it to the pool,
  or use the PooledObject context manager in (2) above.

- Update lib.astakos, lib.quotaholder.http,
  synnefo.api.delegate, pithos.api.delegate to use
  PooledHTTPConnection.

- Update tests

Move UserCache from synnefo.management.common to synnefo.lib.astakos.
Also, update ListCommand with 'astakos_url' and 'astakos_token' class
attributes, which must be declared only when 'user_uuid_field' is used.

Fix inadvertent use of shared objects in synnefo/lib/astakos.py and
pithos/api/delegate.py, since current use is racy when running multiple
requests under gunicorn. Create a private, per-request copy instead.

Stop migraton if it fails to retrieve a uuid/displayname.

* Substitute ``username`` with ``displayname``

`get_user`, `user_for_token` and `authenticate` methods now accept a `usage`
parameter which requests user usage quotas to be returned along with
authenticated user information. Server side handling has also been
implemented.

* It should optionally work with user dictionary 
instead of contacting astakos.
* Fix pep8 errors

Update Astakos API to provider calls for retrieving uuid from the username and vice versa, extend astakos client library (snf-common) and update pithos to use uuids instead of email for account identification

Have the astakos client use pooled HTTP connections to the astakos
service, uses facilities from synnefo/lib/pool/http.py.

to extract token from astakos cookies

Includes the following helpers to be used by synnefo django apps

- logging config initialization middlware
- astakos authentication helpers
- parse_http_date compat helper
- rabbitmq client using pika