[CBBS/CBM] Log PID of cbbackupmgr process

What is the problem?
Our lockfiles contain the hostname cbbackupmgr was from and the PID. We have had customer cases in the past where a lockfile has been left over and it has proved tricky to track down which run of cbbackupmgr put it there.

What is the solution?
In the backup service and in cbbackupmgr we should output the PID of the spawned process/our own PID respectively. That should help us tie together the lock file, cbbs logs and cbm logs.