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Use Astakos' Authentication URL as a single entry point
for the synnefo API.

- avoid registering root url in case <base_path> equals to root url
- additional helper redirect for non trailing slash <base_path> endpoint

webproject contains django command line utils which are imported from synnefo
apps packages.

According to commit: b698d39dd6cbe4bf47b63ed0d6a98b9b126ca40e
views defining their response 'Content-Type' should set the
'override_serialization' attribute of response to 'True'.
However, this was missing in the specific view.
Now this code is moved in ``put_object_headers`` that
is used by both HEAD & GET object requests.

Refs: #3997
k

Implement API call to server statistics about servers and networks.

remove trailing /tokens from `Authentication URL`

duplicated django user_passes_test and login_required decorators to be able
to dynamicaly resolve the url to which we redirect unauthorized users. Replaced
django login_required with astakos.im.views.decorators.login_required.

In migration 0022, ProjectApplication's field `chain' is altered from
a plain integer field to a foreign key. This triggers a south command
to create an index for the said field. However, it seems that sqlite
creates this index automatically, before the create_index command is
issued, which subsequently fails. A check is added here, to handle
this case by skipping the create_index command.

Also, reinstate the data migration part, removed by commit 64c5e1e,
but only if db.dry_run is false. In sqlite, before actually applying
it, a migration is first dry run, in which case data-altering code
should not be run.