Description of problem:
I run VMware->RHV 10 VMs VMs migration, and few minutes are triggering the migration plan, I cancelled it, via CFME UI, (mark all VMs and pressed Cancel).

I cancelled it, because I realized that the conversion hosts max_concurrent tasks was set to nil, and not to 5, as I needed. 
After cancellation, I removed the migration plan.

I edited the conversion hosts max_concurrent_tasks to 5, via Restapi.
After about 15 minutes, I created & run a new migration plan.

Seems that the first migration plan run, had affect on the second migration plan.

Migration details:
10 VMs, with 100GB Disk (66% usage), migrated from a single VMware host, VDDK, using 2 conversion hosts, with max_concurrent_tasks=5 each.

Result:
- On RHV side, there are 8 VMs imported successfully (duration: 2:40)
v2v_migration_vm_0 
v2v_migration_vm_1 
v2v_migration_vm_2 
v2v_migration_vm_3 
v2v_migration_vm_5 
v2v_migration_vm_7
v2v_migration_vm_8
v2v_migration_vm_9
- On CFME UI, it is reported that only 5 out of 10 VMs migrated successfully.
 
Checked v2v import logs in the conversion hosts, now that the VM migration has ended:

* Conversion host #1 (7 log files):
v2v_migration_vm_0, 1, 4 failed. Last updated @ 17:30
v2v_migration_vm_0, 5, 3, 2 passed. Last updated @ 19:30

* Conversion host #2: (7 log files):

v2v_migration_vm_6 failed. Last updated @ 17:30
v2v_migration_vm_3, 2, 1, 7, 9, 8 passed. Last updated @ 18:49-19:34


Version-Release number of selected component (if applicable):
CFME-5.10.5.1/RHV-4.3.4

Expected results:
Cancel migration, should indeed cancel the migration.