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Fix bugs in server creation, in api/server.py:create_server().
More specifically:
 * Make sure to save() the vm object before calling vm.backend_id
 * Delete the vm instance if the RAPI call fails for any reason
 * Use different variable names for the server name at the API level
   and at the Ganeti backend level
 * Compute a random password *before* the CreateInstance() call to Ganeti
   [not currently used though]

Also patch the VirtualMachine model to safeguard against getting the
backend_id of a yet-unsaved instance of VirtualMachine.

Removed description and size from Image model.

* Removes piston dependency.
* Adds dateutil dependency.

Fixes #183 - Implement /servers
Fixes #185 - Implement /images
Fixes #245 - Details in exception handlers
Fixes #249 - Metadata handling
Fixes #253 - Transition to OpenStack API v1.1
Fixes #255 - Fix XML for addresses
Fixes #287 - Piston related bug
Fixes #289 - Support both XML and JSON
Fixes #309 - GUI not refreshing
Fixes #339 - Support API extensions
Fixes #359 - action returns serviceUnavailable
Fixes #361 - return dates with timezones
Refs #301 - Sanitization of API
Refs #315 - Replace API v1.1

Add support in api/v1.1redux for OOB consoles using VNC, refs #349.
More specifically:
 * Implement a new action ("console") for POST to /servers/id/action.
 * Extend api/servers.py to pass the Django request object to actions.
 * Import a version of the vncauthproxy control client under util/.
 * Extend the cloud command-line tool to support getting OOB console access.

Example json: {"console": {"type": "VNC"}}
Example XML:  <console type="VNC" />

To service the call, the API will contact a running vncauthproxy to set up a
time-limited port for VNC forwarding, where the client can connect.

This is WIP. Still missing:
 * A patched version of vncauthproxy.
 * Client-side (GUI) support for requesting an OOB console.

 * implement server reboot/shutdown/start/destroy actions
 * fix ordering on imports (servers.py, actions.py)
 * actions.py: change type to reboot_type (reserverd word)
 * change vm.start_action to backend.start_action where needed
(there is no vm.start_action any more)
 * create server action function in synnefo.js

Refs #311

  * All functionality is achieved through the logic layer

 * remove description from VirtualMachine model, handlers and tests
 * return images metadata (as on servers). for now return image.description as image.metadata.meta.key.description

Ref #185

Instead of imageId/flavorId.

* Add server actions
* Add address listing

API mostly complete now.

Refs #301

Refs #301

- Implemented servers section of the API
- Some new tests

Work in progress.

Refs #301