Add mersdk.env.systemd

Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Add mer-branding as a template

Signed-off-by: David Greaves <david.greaves@jollamobile.com>
[mb2] Deployment --rsync should be done as deviceuser
Remove debug line

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