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This function uses the keystone alike authentication API of Astakos

* tenantName is optional in the request
* check whether the token holder is active and the token has not been
  expired
* update and fix the tests
* update the docs

The ``X-Forwarded-Host`` header should not be forwared to the target
because django appends its value to the Host header and
results in validate_host() failure.

Since the Image Service is not going to be decoupled from Cyclades
we will stop calling it with a different name because it is
frustrating for people who are trying to understand the Synnefo
architecture and the interaction between different services.

We will keep all references to "plankton" inside the code, but we
remove all references inside the documentation. From now on
"Plankton" will be just called "The Image Service" and we will note
that it is a part of Cyclades. The same already happens with
"The Network Service", which doesn't have a special name since it's
part of Cyclades too.

This patch removes all Plankton references inside the documentation,
except from those inside `docs/plankton-api-guide.rst' which will be
removed with a separate patch.

in astakos and branding sections

Add commands `commission-list' and `commission-show' to display
pending commissions. The former supports option `--overdue' to
restrict the age of pending commissions.

Refs #3557

Add new fields issue_datetime in Commission and issue_datetime,
log_datetime in ProvisionLog. Migrate away from custom string-based
issue_time and log_time fields.

Automatically convert a datetime to string using isoformat from
snf_django.lib.api.utils

Also add a notice in docs that inviting is currently disabled.

Also list in a separate section the pithos-manage-accounts commands

Also fix some help messages.

- removed `user-` prefix for shorter command names
- condensed auth-policy to authpolicy

the new api changed image/flavor keys only in servers response.
imageRef and flavorRef are still required in server create requests
(makes sense)

Refs: #3768

the updated api uses /metadata/ instead of /meta/

Refs: #3768

Refs: #3768

Update javascript libraries to keep up with the latest changes in compute api.

Rename attribute of GET /flavors response, from 'cpu' to 'vcpus'.
Catholicaly remove "values" term from requests and responses
cyclades: Rename meta to metadata at Cyclades URLs:
    * /servers/<server-id>/meta
    * /servers/<server-id>/meta/<key>
    * /images/<image-id>/meta
    * /images/<image-id>/meta/<key>

Refs: #3768

Rename attribute of GET /flavors response, from 'cpu' to 'vcpus'.

Refs #3768

Update tests to use OpenStack Compute API v2.

Refs #3768

Rename 'flavorRef' to 'flavor' and 'imageRef' to 'image', to responses of
/servers API. 'flavorRef' and 'imageRef' are still preserved to to request
parameters of POST /servers.

Refs #3768

For compatibility with OpenStack Compute API v2, we remove the
term 'values' from all JSON requests and responses.

Refs #3768

For compatibility with OpenStack Compute API v2, rename 'meta' to
'metadata' to Cyclades API URLs. Specifically, to the following ones:

* /servers/<server-id>/meta
* /servers/<server-id>/meta/<key>
* /images/<image-id>/meta
* /images/<image-id>/meta/<key>

Refs #3768

The Administrator's guide should include an up-to-date list of all
'snf-manage' management commands for all services.

Create the corresponding section in the Admin guide and move the
latest Astakos commands there from the old Astakos README file.

Pithos and Cyclades commands will be added in a separate patch.

Email subjects are parameterized by site name and application-
specific data. Other than that they should be constants rather
than settings.

Remove unused GROUP_CREATION_SUBJECT.

type parameter is mandatory in private network creation requests.

Remove unused settings BILLING_FIELDS and QUEUE_CONNECTION.