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Create 'mocked_quotaholder' context manager to bypass commission and use
it in Cyclades tests. Also this commit does some various fixes to other
tests.

Extend 'issue_and_accept_commission' function to resolve previous
unresolved commission, if exists. In order to resolve it, the
commission must not be pending, because if it is there is not
enough information to resolve it.

Refactor Cyclades code that handles commissioning with Quotaholder. This
commit removes the 'uses_commission' decorator. Instead it introduces
the 'issue_and_accept_commission' function that is responsible for
implenting the commission workflow. This function  must be called
exactly after and in the same transaction that creates/modifies the
resource, because resource creation/modification must happen in the same
transaction with issuing and storing the serial in the DB.

* Merge 'accepted' and 'rejected' field to 'accept' field.
* Add 'resolved' field, indicating whether this commission has been
  accepted/rejected to Quotaholder
* Remove custom save() method. Handle 'pending' field manually.

Also add the corresponding database migrations.

Do not consider 0 usage for users and resources that are not included in
Quotaholder resources list, since Quotaholder returns zero usage for all
users and all resources. If a user/resource does not belong to QH
respond then it can not be an Astakos user.

Refs #3606 #3491 #3661

Rename 'cyclades-reconcile-commissions' to 'reconcile-commissions-cyclades.'
Rename 'cyclades-usage-verify' to 'reconcile-resources-cyclades.'

Extend 'cyclades-usage-verify' management command to cover the usage of
'cyclades-reset-usage' and remove the second one. The new command
reconciles resources(usage) by detecting inconsistencies between the
usage of resources in Astakos and Cyclades DB and fixing them by issuing
a commission with the difference of the usage in DB and Astakos. If
there is a pending commission for a resource, reconciliation for this
resource is skipped. Refs #3627

Also, make this command do not consider only users that exist in
Cyclades DB, but also users that exist in Quotaholder. For such users,
it is assumed that they have zero usage for all Cyclades resources.
Refs #3606 #3491

Remove from cyclades all settings that were relative with Quotaholder.
Remove CYCLADES_USE_QUOTAHOLDER settings, since Cyclades can not work
any more without quotas.
Remove CYCLADES_QUOTAHOLDER_URL and CYCLADES_QUOTAHOLDER_TOKEN since
Quotaholder is merged with Astakos.

Remove 'TRANSLATE_UUIDS' from plankton setting.

Remove 'PITHOS_USER_CATALOG_URL' and 'PITHOS_USER_FEEDBACK_URL' and
'PITHOS_USER_LOGIN_URL' settings, since all of them can be derived from
'ASTAKOS_URL' setting.

Remove 'CYCLADES_USER_CATALOG_URL' and 'CYCLADES_USER_FEEDBACK_URL'
settings, since both of them can be derived from 'ASTAKOS_URL' setting.

Distinguish exceptions while using AstakosClient to communicate with
Astakos, from the rest API errors.

Make --flavor-id mandatory in 'snf-manage server-create' management
command.

Update 'network-create' management command, to require an owner when
creating a private network.

Make list command order results either by 'order_by' class attribute,
or by primary key.

Provide console script astakos-migrate-0.14.
Also update related upgrade notes.

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

Unify these operations when registering a pending application,
in order to make sure no commission can be left pending.

Sync number of pending applications to quotaholder.

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.

State of public NIC should be 'BUILDING'

Migration 0001 should be faked on an existing database.
Migration 0002 adds new fields.
Migration 0003 populates the new fields based on the old ones.
Migration 0004 deletes unneeded fields and tables.

In order to facilitate migrations.