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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

Refs #3440

Refs #3440

Most astakos-quotas calls use services' tokens

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

Refs: #3419

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