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Pithos in case of missing blocks during smart object write
(using hashmap) used to raise an api fault with payload
the list with the missing blocks serialized in json format.

However, the common api_method decorator in case of api fault
returns a different response content format containing details about
the fault.

This causes problem to pithos clients which expect
a specific response content format in that case.

The solution was adopted is:
when pithos server detects such a case returns directly
an HttpResponse with the same status code (409) as before
and the expected content.

Remove check for response Content-Type, since 'django.http.HttpResponse'
has always a default Content-Type of 'text/html; charset=utf-8'. Views
defining their response 'Content-Type' should set the
'override_serialization' attribute of response to 'True'.

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'.

Remove this setting as it introduces unnecessary complexity. Also,
it will need to be supported by snf-astakos-client. If needed by
tests to bypass communication with astakos, a mocking library should
be used.

Update all pithos API methods to use the new common 'api_method'
decorator. However, this decorator is not enough for pithos since
pithos methods require some extra tasks:
* Create a PithosBackend connection
* Handle special HTTP headers

For these reasons, pithos defines a custom 'api_method' decorator, which
is decorator by the common 'api_method' decorator.

Gather all faults from all synnefo projects into common
'snf_django.lib.api.faults'.

Expose public URL information only to the object owners.

Translate X-Source-Account if TRANSLATE_UUIDS is set

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

Refs: #3149

Provide account name (not only uuid)

Refs: #2611

Refs: #2611

Refs: #2394

Refs: #2394

Refs: #2394

Fixes #2300

Refs #1792

Refs #1792