CP-8120 Rolling Pool Upgrade wizard: add precheck for vCPU configuration.

- Renamed “Checking can evacuate host status” precheck group to “Checking VM migration status”
- Prechecks page – check that all VMs have valid vCPU settings (i.e. number of vCPUs is a multiple of number of cores per socket).
- This check is included in the ‘Checking VM migration status” group
- If a VM has invalid vCPU settings, the precheck will display the problem with a solution to “Fix vCPU configuration” which opens the VM Properties dialog on the CPU page.

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>