add a test c program, it will generate high cpu loadaverage
1. delete the sh file, use sysmonitord to replace
2. in the sysmonitord
	a. echo the pid to $pidfile
	b. fork a process to perform the cpu usage getter
1. add a rc-sysmonitord file, it is a rc script file,
2. it should be put into /usr/local/etc/rc.d