qubes/core2migration: fix vm.template handling
qubes/core2migration: fix vm.template handling

VM constructor can't be given just template QID, it must be TemplateVM
object.

QubesOS/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin