Merge branch 'release/0.4.1' into develop
Improve io and disk watchdog
Improve disk-watchdog for leofs-1.2.2
Improve cpu-watchdog for leofs-1.2.2
Improve cpu-watchdog for leofs-1.2.2
Fix disk-subscriber and optimize code
Improve subscriber
Improve subscriber - add unixtime in a notification message
Improve watchdog-state
Change function name of the subscriber client
Change function name of the subscriber client
Fix calling function of the subscriber
Add watchdog-related constats for clients
Change find-not-safe-items fun
Add testcase
Support leo_watchdog_disk for FreeBSD
Support leo_watchdog_iostat for FreeBSD
Fix leo_watchdog_iostat to run on CentOS properly
Support leo_watchdog_(disk|iostat) on SmartOS
Add output error log