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Use backend astakosclient instance to query the account quotas.

Change database field to TextField in order to avoid restrictions on the
redirect url lengths
Update tests

This fix introduces a database migration of the oa2 app

Refs: #4804

This change should have been included in commit
3df48a3faa0d84bdb2c945d117929e17dc999d59
but was mistakenly left out.

Change all Astakos messages to reflect the new sign up procedure:

 * first send a verification email
 * user clicks on verification link
 * mark as pending moderation
 * activate

Since now we have more services and we have separate guides for each
service API, it is misleading to keep component names in guide file
names. Rename file names to reflect the actual service they describe.

 * astakos-api-guide -> identity-api-guide
 * pithos-api-guide -> object-api-guide
 * cyclades-api-guide -> compute-api-guide

 * Separate Developer's guide from API guide
 * Update API guide to reflect the latest changes
   mostly regarding Networks
 * Create an empty Network API guide to get filled
   with the Neutron API specification
 * Add the corresponding link to the API guide in index
 * Remove obsolete Integrator's guide

TODO: Refactor/remove/update the Integrator's Quick Installation
Guide which is now out-of-date. Sort out what we should keep and
merge them to the other guides.

* clear QuotaHolderSerial objects when resolving pending commissions.
* Fix wrong name of Ganeti opcodes.
* Do not update vm's flavor before issuing new commission

Make reconciliation mechanism take an exclusive lock on objects before
issuing messages for reconciliation events. This will make
reconciliation mechanism more slow, but will ensure correct quotas when
reconciliation is run while the service is online.

Remove the name field

Fix snf-manage oauth2-client-list command arugments

no longer needed since feedback overlay is not manualy triggered any more.

Extend 'Subnet' model with 'userid' and 'public' attributes. This is
required in order to avoid an expensive join when listing subnets. This
commit also includes a database migration for existing subnets.

display error message instead of returning a 404 response

remove both existing third party authentication and unverified user entries
when the third party identifier gets used.

Custom EmailValidator class backported from django 1.6

prevent encoding errors

* Propery handle IDs that weren't an integer

* Set detail=True by default for networks and ports
* Update subnets to support /detail

Add option in enforce-resources-cyclades to specify the maximum number of
operations to perform per backend.

Also ensure that quota are always checked in the same order.

Kamaki changed its API and now AstakosClient has been renamed to
CachedAstakosClient whereas the AstakosClient class points to the
astakosclient package.

Conflicts:

	docs/admin-guide.rst
	docs/quick-install-admin-guide.rst

Fix default values for DB model factories.

Fix migration that caused creation of Subnet for networks that did not
had enabled the 'dhcp' option.

Fix corner case where a port seems to be still attached to a VM although
the VM has already been deleted.

Security groups are not working yet. Comment out relevant tests.