Start work on 1:0.2.98.2
gpu-manager.{c|py}: be more tolerant with xorg.confs

This will fix the multi AMD GPU use case where aticonfigs insists
on not setting the PCI domain in the xorg.conf (LP: #1310489).
Release 1:0.2.98.2
Start work on 1:0.2.98.3
gpu-manager.c: add support for gpumanager_uxa and gpumanager_modesetting boot parameters

This works around LP: #1365695
Release 1:0.2.98.3