Fix migrate-tools for multiple devices (#113)
Fix migrate-tools for multiple devices (#113)

Don't fail with duplicate key errors if there is more than one row already in the devices table, since it attempts to update the device_id column.
naconner/lamassu-server,joshmh/lamassu-server,lamassu/lamassu-server,naconner/lamassu-server,joshmh/lamassu-server,naconner/lamassu-server,joshmh/lamassu-server,lamassu/lamassu-server,lamassu/lamassu-server,joshmh/lamassu-server