remove all non-essential parameters from the heartbeat executable

[tbeerman]

Motivation

The executable across the daemons is not uniform. Some only use the daemon name, some use the full path and others the path plus all cli arguments. E.g.,

rucio-undertaker
/usr/bin/rucio-reaper2
/usr/bin/rucio-conveyor-receiver --total-threads 5

The sharding is based on the executable and in the example above if two receivers would be started, one with 5 threads and one with 10 threads, they wouldn't share the load.

Modification

Remove the path and all non-essential cli arguments.