6744a7417a
Check docker's pid file, then fallback to pidof when trying to determine the pid for docker. The latest docker RPM for RHEL changes /usr/bin/docker from an executable to a shell script (to support /usr/bin/docker-current and /usr/bin/docker-latest). The pidof check for docker fails in this case, so we check /var/run/docker.pid first (the default location), and fallback to pidof if that fails.