Query the number of Plant owners

for example: http://api.shinemonitor.com/public/?sign=7f220b6f21d0b52d0452d9c66ffe1f4f84635b81&salt=2337424845041575962&token=91a6c87e89acbfb2fa482f3b02ee071ee58ea0293dd92f243a88ee51415f497f&action=queryPlantOwnerCount&source=0&_app_client_=android&_app_id_=com.demo.test&_app_version_=3.6.2.1

response:

{
    "err":0,
    "desc":"ERR_NONE",
    "dat":{
        "count":8
    }
}