docs: Add HPCloud example to OpenStack documentation>

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Re-generate documentation fixture files.
Update committer guide.
docs: Update FAQ page.
docs: Update committer guide.
Fix a bug in Abiquo driver which caused the driver to fail if the endpoint
URL didn't start with "/api".

Reported by Igor Ajdisek, part of LIBCLOUD-447.
Refactor CloudStack driver and consolidate repeated code inside the _to_node
method.

Also fix an issue with public_ips map which was not properly populated because
dictionary key was a string but a code incorrectly passed int to it.
Make the node name detection in CloudStack driver more robust. Some newer
versions use 'name' instead of 'displayname' attribute.
Update invalid docstring.
LIBCLOUD-430: Implement support for content-disposition header in the CloudFiles driver.

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Update CHANGES.
Update CHANGES, reference the right issue number.
On GCE, Images no longer always have preferredKernel set.

Signed-off-by: Tomaz Muraus <tomaz@apache.org>