Bug 1964268: Copied signoff blocks to self need db row

When copying a signoff block from another owners page it sets up a row
in view_signoff_verify as expected. But when copying own page it
doesn't

So fixed that and have upgrade step to fix existing data

Change-Id: Id372a5da29aaaf53884ffee60ae8b9d9b4738992
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>