conmon: new option --conmon-pidfile=
conmon: new option --conmon-pidfile=

This change is needed by libpod to store the PID of the conmon process
after the fork to a file, so that systemd can watch the process:

Type=forking
PIDFile=/run/awesome-service.pid
ExecStart=[...]/conmon --conmon-pidfile=/run/awesome-service.pid [...]

Signed-off-by: Giuseppe Scrivano <20002b7b24c75512093a71a58285826d5c504fca@redhat.com>

nalind/cri-o,mikebrow/cri-o,kubernetes-incubator/cri-o,vbatts/cri-o,nalind/cri-o,kubernetes-incubator/cri-o,rhatdan/cri-o,kubernetes-incubator/cri-o,mikebrow/cri-o,kubernetes-incubator/cri-o,jwhonce/ocid,mikebrow/cri-o,rhatdan/cri-o,kubernetes-incubator/ocid,rhatdan/cri-o,jwhonce/ocid,vbatts/cri-o,rhatdan/cri-o,nalind/cri-o,kubernetes-incubator/ocid,vbatts/cri-o,vbatts/cri-o,kubernetes-incubator/ocid,mikebrow/cri-o,jwhonce/ocid