[PULL 05/10] colo: make colo_checkpoint_notify static and provide simpler API

From: Vladimir Sementsov-Ogievskiy colo_checkpoint_notify() is mostly used in colo.c. Outside we use it once when x-checkpoint-delay migration parameter is set. So, let's simplify the external API to only that function - notify COLO that parameter was set. This make external API more robust and h

[PULL 05/10] colo: make colo_checkpoint_notify static and provide simpler API

From: Vladimir Sementsov-Ogievskiy colo_checkpoint_notify() is mostly used in colo.c. Outside we use it once when x-checkpoint-delay migration parameter is set. So, let's simplify the external API to only that function - notify COLO that parameter was set. This make external API more robust and h