Fix monit false alarm issue, which located in process_checker and it missed "disk-sleep" status check, thus some 201911 SONiC box report "pmon|sensord" error coincidently.
#### Why I did it
Currently psutil library returns below detail process status:
running: The process is currently running.
sleeping: The process is sleeping or waiting for an event to occur.
disk-sleep: The process is waiting for I/O operations to complete.
stopped: The process has been stopped (e.g. via the SIGSTOP signal).
zombie: The process has terminated but is still listed in the process table.
dead: The process has terminated and has been removed from the process table.
We should regard running/sleeping/disk-sleep as normal case and not alert in monit process.
Now once the disk-sleep occurs during monit cycle, below syslog will be paged, so get rid of syslog output meanwhile.
yslog.2.gz:Feb 24 06:12:17.394619 MEL23-0101-0301-04T1 ERR monit[6040]: 'pmon|sensord' status failed (1) -- '/usr/sbin/sensord -f daemon' is not running in host
syslog.2.gz:Feb 24 06:13:17.932531 MEL23-0101-0301-04T1 ERR monit[6040]: 'pmon|sensord' status failed (1) -- '/usr/sbin/sensord -f daemon' is not running in host
syslog.2.gz:Feb 24 06:14:18.502505 MEL23-0101-0301-04T1 ERR monit[6040]: 'pmon|sensord' status failed (1) -- '/usr/sbin/sensord -f daemon' is not running in host
Then I tried to reproduce the issue by triggering process_checker for sensord frequently and observed it's under "disk-sleep" status once the alert is raised.
##### Work item tracking
- Microsoft ADO **(number only)**:17663589
#### How I did it
Fix process_checker script code for adding "disk-sleep" case handling.
#### How to verify it
Verified in local DUT.
a5043bfc84