[vMotion]Migrate... is gray out on a powered-on VM

[schumi]

https://kb.vmware.com/s/article/2044369

1. shutdown VC
2. delete data in VCDB
3. start VC

DB steps
1. select * from VPX_VM WHERE FILE_NAME LIKE '%VM1%'
2. memo the number in ID field
3. select * from VPX_DISABLED_METHODS WHERE ENTITY_MO_ID_VAL = 'vm-ID'
4. delete from VPX_DISABLED_METHODS WHERE ENTITY_MO_ID_VAL = 'vm-ID';