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A new endpoint (astakos_oauth2) was added to Astakos service.
Add this endpoint to the astakosclient tests.

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.

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.

Strip padding ("=") introduced during the base64 encoding.
Update token examples in docs.

This function uses the keystone alike authentication API of Astakos

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.

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

Refs: #3340

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.

All Exceptions that AstakosClient is raising should
be under AstakosClientException class

The following indicators are returned for each holding:
"limit": the quota limit (as before)
"usage": the current usage (pessimistically, includes any pending
         allocations)
"pending": the difference of max and min allocation, indicates
           that there are pending commissions on this holding

Replace `available' by two fields: `limit' and `usage'.

Refs #3440

Refs #3440

Refs #3440

Refs #3440

Refs #3440

All Exceptions that AstakosClient is raising should
be under AstakosClientException class

Refs #3440

Refs #3440

Rename functions/methods according to PEP-8 naming conventions.

* NoDisplayName
  raised if getDisplayName called with non-existing uuid

* NoUUID
  raised if getUUID called with non-existing display_name

* Move retry decorator to utils module.
* Rename exceptions to be more intuitive.
* Add 403 Forbidden exception.
* Move exceptions to errors class

* AstakosClientEInvalid:
    Invalid X-Auth-Token, 401
* AstakosClientEMethod:
    Method not allowed, 400
* AstakosClientENotFound:
    Not Found, 404

Remove token argument from class initialization
method and make it a mandatory argument to all
the other class methods.