[packaging] Added workaround for openssh rpm upgrade

We have nasty problem with old openssh package. Old package tries to stop sshd.service during uninstallation and it fails if sshd.service file is not installed. Because that file is installed only when developer mode is enabled (server installed),  we will fail during upgrade. To overcome that problem,  we have to create fake service file and remove it when upgrade is over.

Signed-off-by: Pekka Lundstrom <pekka.lundstrom@jollamobile.com>