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Add API call for a service to request the project quota for its own
resources.

Add issue_commission wrapper for assigning resources to a new project.

Both issue_one_commission and the new call issue_commission_generic act
as wrappers on top of _issue_commission. They create the appropriate
project-level provisions, based on the original ones provided by the
astakosclient user.

Don't use basicConfig inside astakosclient library. This function should
be called from the main thread. The user of our library should be able
to set a handler for `astakosclient' logger if she wants to.

Add an option to _fill_endpoints to only query for the oauth2
endpoint if needed. This way we are keeping astakosclient compatible
with the older Astakos versions.
Signed-off-by: Ilias Tsitsimpis <iliastsi@grnet.gr>
Signed-off-by: Sofia Papagiannaki <spapagian@grnet.gr>

Change setting and url prefixes from `oa2` to 
`oauth2`

This feature is useful for logging by external applications like kamaki
New member variables:
  self.log_request=dict(method=.., path=.., headers=.., body=..)
  self.log_response=dict(status=.., message=.., data=..)

Use POST /tokens to authenticate. Delete AstakosClient.get_user_info()
and replace its uses by AstakosClient.authenticate().

Introduce function authenticate(), which performs POST /tokens in
private mode, i.e. giving a token to be checked for authentication.
Function get_endpoints() performs the call in public mode, in order
to retrieve the endpoints.

Initialize endpoints lazily: when a URL is missing, get_endpoints()
is triggered.

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

Accept auth_url as the default entry point and
query astakos endpoints to find out the
account and ui urls.

This commit makes astakosclient PEP8 compliant.

Fix some Astakos' urls paths that were broken.
Remove get_endpoints and rename get_user_info_with_endpoints
to get_endpoints.
Fix tests.

https://service.deployment.vendor.tld/service-base/api-prefix/hard/path
|___________________________________| |__________| |________| |_______|
             BASE_HOST                  BASE_PATH    PREFIX    Hardcoded
|_________________________________________________|
             SERVICE_BASE_URL

- Introduce <SERVICE>_BASE_URL setting, and <API>_PREFIX constants
  for all services. Extract BASE_HOST, BASE_PATH from the setting.

- Use settings and constants to construct top-level patterns
  (base-path/api-prefix) in services' urls.py

- Refactor/extend proxy() to be compatible with the above.

- Change URLs passed around (ui, e-mails) to be compatible.
  (needs more work)

Notes:

This configuration REQUIRES that any rewriting and proxying on the
front-end must eventually result in the application server (gunicorn)
getting the original path of the request, otherwise the view-generated
URLs will be different.

Changes:
- set top-level urlpatterns from <SERVICE>_BASE_URL
- rename setting: APP_INSTALL_URL to CYCLADES_BASE_URL
- rename setting: ASTAKOS_URL to ASTAKOS_BASE_URL everywhere
- introduce setting: PITHOS_BASE_URL
- update shipped .confs, quick install admin guide, upgrade guide
- fix urls/views/reverse()/other that were broken
- (more not listed)

This function uses the keystone alike authentication API of Astakos

Export astakos api urls as global variables that can be
easily changed, rather than hard coded values.

do not lstrip slashes from the path of astakos url to avoid making requests
with relative uris.

Refs: #3340

This reverts commit da18207e2825b4a0a4cb3abc6a9fbef541eda05b.
Issue resolved by commit 214058a911c5b4b8b3d9108ba891536a0b40dc49.

In resolve_commissions, accept_serials and reject_serials
may be empty lists. Don't do a validation check for this
parameters and let the servers respond with an error
if bad values was given.

Support issue_commission's `name' parameter for an optional description
of the commission. Include this field in the dict returned by
get_commission.

Change astakosclient accordingly.

So that it follows the naming scheme of other astakosclient calls.

All Exceptions that AstakosClient is raising should
be under AstakosClientException class