Tested on a fresh infrared deployment, the ports are now configured correctly:
[heat-admin@compute-1 ~]$ sudo docker exec -i nova_libvirt grep migration_port /etc/libvirt/qemu.conf
#migration_port_min = 49152
#migration_port_max = 49215
migration_port_min = 61152
migration_port_max = 61215
Marking this as VERIFIED.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.