core: editable properties for template

Migration support and pin host aren't editable for template.
Commit 5460e6ba7306028704cfae2e3a604a3b101f8f15 changed it
to editable only when VM is down, but neglected editable on
template.

Change-Id: I5d7b331e84214242f6b42c67300c16b6db5d5640
Signed-off-by: Gilad Chaplik <gchaplik@redhat.com>