 check process DVSwitch_API
   matching "dvswitch-api/api.py"
   group dvswitch
   group DVSwitch_API
   start program = "/usr/bin/systemctl start dvswitch-api"
   stop  program = "/usr/bin/systemctl stop dvswitch-api"
   restart program = "/usr/bin/systemctl restart dvswitch-api"
   if does not exist then alert
