core: Suuport aborting migration on qemu error

following libvirt support[1] and vdsm[2] to abort an on going migration
on any error using a flag, adding this to the engine from version >= 3.3

[1] https://bugzilla.redhat.com/972675
[2] https://bugzilla.redhat.com/961154

Change-Id: I048c96f049d24b9793af669d513d1e9f2e1f24ec
Bug-Url: https://bugzilla.redhat.com/886416
Signed-off-by: Roy Golan <rgolan@redhat.com>