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- Avoid settings overrides from conf files inside SYNNEFO_SETTINGS_DIR
  Tests are expected to succeed with exact setting values defined either
  in tests modules/cases or in the default synnefo setting modules. To
  ensure this we temporarily set SYNNEFO_SETTINGS_DIR environmental variable
  to a non existing directory.
- Use DEBUG=False by default. We want our code to be tested in an
  settings environment as close to what we would set in a production
  deployment.
- Set initial astakos IM_MODULES setting to be able to test third party
  providers. This will be removed once we manage to dynamically run
  different tests with different IM_MODULES combinations

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

Assume a resource `astakos.pending_app' related to service `astakos'.
On submitting an application, issue a commission that will update the
related counter if possible, and accept the commission on success.
On approving/denying/cancelling an application, update the counter
likewise.

We always charge the application `owner'; however, if the `applicant'
is a project admin, we issue commission in force mode which succeeds
even if it exceeds the limit.

In order to pre-emptively check in the UI, follow the same process in
`dry run' mode, which issues a commission and rejects it on success.

Remove option of user-update to set its limit.

Refs #3349

It is the API code's task to transform the input dict to list.

Class structure is no more needed; there is no need for initialization,
since the code is used internally.

Also merge all migrations from 0026 to 0032.

All calls take a request_user (of type AstakosUser) argument.

Do not update holding limit if there exist user-specific base quota
for the particular resource.

Make sure that no Commission or Provision entry is created when
issue_commission fails, even if the transaction is committed.

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'.

also include services for which no existing presentation data exist.
Admin can use ASTAKOS_SERVICE_META setting to customize the service
presentation metadata.

Update view to use the introduced astakos quotas api.

Using this parameter, the service can query the quotas of a specific
user.

Needed for formfield() method.

Rename it to fields.py and update all migrations that reference the field.

Remove quantity, import_limit, export_limit.
Update user-set-initial-quota management command.