pithos: Fix missing 'Content-Disposition' in response

Since version 0.15 a specific content disposition type can be enforced in
requests for an object's content, using the 'disposition-type' optional
parameter.

Erroneously, if "disposition-type" is not provided, 'Content-Disposition'
header is not returned in the response.
pithos: Handle spaces in 'Content-Disposition'

Handle properly objects whose name contains spaces
pithos: Add tests for the 'Content-Disposition'
burnin: Filter flavors based on 'SNF:allow_create'

Filter out flavors that are not allowed to create a machine.
Update snf-ci to support the same functionality.
snf-ci: Fix a typo in SynnefoCI '__init__'

Replace 'kamaki_cloud' variable with 'self.kamaki_cloud' property.
astakos: Show label adjacent to checkbox

Closes #38
pithos: Reject XML in uploads with hashmap

Do not accept XML formatted request body
helpdesk: Detect IPv6 address in search query

Refs #33
cyclades: Fix the check about stale NICs

Fix the check about whether a NIC(port) in DB is stale, which could
result in the NIC to wrongly be deleted from Cyclades DB.