chore: Update Falcon dep to allow version 0.1.7
chore: Update Falcon dep to allow version 0.1.7

The latest version of Falcon contains some bug fixes, as well as
the ability to automatically respond to OPTIONS requests, something
that we rely on for "follow-your-nose" clients; the home document
does not list every endpoint (only those that would otherwise be
undiscoverable).

Change-Id: I7767d44ec7fabb69bf771b6e709f521606e6d0a0

openstack/zaqar,openstack/zaqar,rackerlabs/marconi,openstack/zaqar,openstack/zaqar