Avoid failure if process checked user is different from riemann agent. Also added some verbosity if pidfile is unreadable.
Avoid failure if process checked user is different from riemann agent. Also added some verbosity if pidfile is unreadable.

tehgeekmeister/riemann-tools,Artesonraju/riemann-tools,aphyr/riemann-tools,peterneubauer/riemann-tools,riemann/riemann-tools,pepoirot/riemann-tools,shanielh/riemann-tools,nandudheeraj/riemann-tools,riemann/riemann-tools,krakatoa/riemann-tools,uswitch/riemann-tools,hybris/riemann-tools