This patchset adds a ReST client for the placement API. This
client is used to update the IPv4 inventories associated with
routed networks segments. This information is used by the
Nova scheduler to decide the placement of instances in hosts,
based on the availability of IPv4 addresses in routed
networks segments
DocImpact: Adds [placement] section to neutron.conf with two
options: region_name and endpoint_type
Change-Id: I2aa614d4e6229161047b08c8bdcbca0e2e5d1f0b
Partially-Implements: blueprint routed-networks