Description of problem:

In former MTV version,  "Migrate shared disks" is set by default, we need to keep this by setting "Migrate shared disks" by default in "Create migration plan" - "Additional set up" page

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

MTV 2.9.0 (forklift-fbc-prod-v419:on-pr-0a284bcac660e2515fe8d0f7e5fd3894438e96c3) with CNV 4.19.1

How reproducible:

Always

Steps to Reproduce:

1) Try to create migration plan, the "Shared disks" is not set by default, we need to keep this default setting.