Manage services as used by Mer

Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Add a "ready" trigger to init to run post boot

Change-Id: Icdeeefd509092cfd922c71e22142c72aa189d3c4
Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Notify Mer's systemd that we're done

Change-Id: If6a16f43397f00c8e579af79ae6cf8459786e7b3
Signed-off-by: David Greaves <david.greaves@jollamobile.com>