[Pacemaker] Migration atomicity

[Vladislav Bogdanov]

Hi,

I'm observing a little bit unintuitive behavior of migration logic when
transition is aborted (due to CIB change) in the middle of the resource
migration.

That is:
1. nodea: migrate_to nodeb
2. transition abort
3. nodeb: stop
4. nodea: migrate_to nodec
5. nodec: migrate_from nodea
(note: no stop on nodea)

While I expect migration operation pair to be "more atomic":
1. nodea: migrate_to nodeb
2. transition abort
3. nodeb: migrate_from nodea
4. nodea: stop
5. nodeb: migrate_to nodec
6. nodec: migrate_from nodeb
7. nodeb: stop

Is the current behavior intended?

hb_report is available.

Best regards,
Vladislav