cyclades: Catch corner case in reconciliation

Include 'ERROR' in the states for which we check if the NIC exists in
the Ganeti instance.
ci: Update flavor option for burnin

Do not use only file disk templates, since an archipelago disk template
is required for snapshot tests.
cyclades: Add snapshot property in lowercase

Snapshot properties are stored in lowercase in Pithos DB. It is the
image/plaknton API that converts them to uppercase.
cyclades: Get Pithos objects by their UUID

Use the newly introduced 'get_object_by_uuid' method to get a Pithos
object by its UUID, instead of mapping a UUID to a (account, container,
name) tuple.

Also, remove the '--user' and '--public' options from 'image-show' and
'snapshot-show' management commands. Instead, use the
'check_permissions' option to bypass Pithos permission check.

Finally, fix plankton tests to mock the 'get_object_by_uuid' method.
docs: Update debian install guide
docs: Update upgrade release-0.16 guide
pithos: Add umask option on gunicorn conf file
Use proper delimiter for excluded packages

The proper delimiter for SYNNEFO_EXCLUDE_PACKAGES should be ":", not
" ". Also, exclude the snf-admin-app when testing Pithos.
cyclades: Re-raise exception when snapshots fail

When we cannot send a Ganeti job for a snapshot, we must re-raise the
exception after setting the snapshot's status to error.
pithos: Refactor Gunicorn conf file

Remove shared memory file, /dev/shm/wid, and use a
shared memory mapping instead for the Gunicorn worker
ID bookkeeping.
pithos: Make pithos.conf.py Synnefo wide accessible

Rename pithos.conf.py to gunicorn-archipelago.py and move it
to snf-webproject under the directory gunicorn-hooks to
make it wide accessible.
snf-deploy: Update Gunicorn conf file

Update Gunicorn conf file and relevant files.
pithos: Remove obsolete Gunicorn worker
docs: Update upgrade doc for 0.16
docs: Update Debian installation guide
docs: Update CentOS installation guide
docs: Fix typo
admin-ui: Modify html templates

- Modify html structure of filters.
- Modify html of checkboxes, radiobuttons and arrow-buttons
- Add a dropdown list with all the available filters in each page
- Minor rewording
admin-ui: Add more style rules

- Modify style of filters
- Add style rules in order to change the state of checkboxes,
  radiobuttons and arrow-buttons by css
- Fix rendering bugs noticed in Firefox
admin-ui: Update icon-font and corresponding files