Description of problem:

Live migration of non-NUMA non-pinned instances does not update cpu_shared_set mapping

Version-Release number of selected component (if applicable):

16/Train

How reproducible:

100%

Steps to Reproduce:

1. Two compute hosts, cpu_shared_set=0,1 on hostA, cpu_shared_set=2,3 on hostB
2. Boot a non-pinned, non-NUMA instance on hostA
3. Live migrate to hostB

Actual results:

Instance remains pinned to CPUs 0,1 in the XML

Expected results:

XML updated to pin instance to CPUs 2,3