How to install the plugin into nagios:
1. install Python3 and paramiko
2. add line "cfg_dir=/usr/local/nagios/etc/svc" to the end of file /usr/local/nagios/etc/nagios.cfg
3. create directory /usr/local/nagios/etc/svc and /usr/local/nagios/etc/svc/hosts
4. create a host definition named XXX.cfg and put in /usr/local/nagios/etc/svc/hosts  (the plugin have offered a sample 10.10.10.10.cfg)
5. copyt files "svc_commands.cfg" and host_info.properties to /usr/local/nagios/etc/svc (the host_info.properties stored the host username/password, )
6. copy file check_svc,device_mgr.py,sshUtils.py to /usr/local/nagios/libexec , and give rw access
7. restart nagios to load the host