CA-103062: Fix for preventing vm pause during SXM

assert_can_migrate needs to be grouped with migrate_send operation inside with_vm_operation so that while SXM is in operation, vm pause should not interfere after assert_can_migrate completes or in between

Signed-off-by: Ravi Pandey <ravi.pandey@citrix.com>
Merge pull request #1540 from ravippandey/CA-103062

CA-103062: Fix for preventing vm pause during SXM