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We have to do this in order to fix namespace inconsistencies (files in
synnefo use imports starting with synnefo)
refs: #393

One API test (test_servers_details) was too restrictive and failed
with the PostgreSQL backend. It assumed consistent, by-id ordering
between DB and API server list replies, and failed although there was
1-1 correspondence between the two replies.

To fix, the test takes care to order the two replies by id before
attempting to compare their contents.

Removing the description field from the Image model
and moving it to ImageMetadata broke the fixtures in
db_test_data.json and the associated tests of the db app.

Tests for api, db, logic run properly.

Make use of it in tests.

Django requires it.

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.

Have api/util.py:isoparse() return naive datetime objects, in UTC.
Fixes #377.

Fix the fixtures for the Image model, removing references
to the size attribute, which no longer exists in the Image model
since commit 838c404d4.

Also fix unloadable fixtures, by removing stray comma chars
in JSON.

Please verify that it fixes #377

Refs: #377

manage.py test api should work now