Update FreeBSD load average for 1 min
Update FreeBSD load average for 1 min

This changes the load array retrieval method by parsing the output of
the 'uptime' command and creating an array of load average values.

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