Description of problem:

--net=host was hardcoded in the startup line of the system unit so even though
mon_docker_net_host was set to False the net option would always be
activated.

mon_docker_net_host is set to True by default so this commit does not
change the behavior.

Version-Release number of selected component (if applicable):

v3.1.0rc9

How reproducible:

Run a container mon, set mon_docker_net_host to false and --net=host will remain

Steps to Reproduce:
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Actual results:


Expected results:


Additional info: