Permit container network attachments to set any static IP address within
the network's IPAM master pool, including when a subpool is configured.
Users have come to depend on being able to statically assign container
IP addresses which are guaranteed not to collide with automatically-
assigned container addresses.
Signed-off-by: Cory Snider <csnider@mirantis.com>
(cherry picked from commit 058b30023f)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>