Migrate addhost.php to lnms device:add (#13870)

* Migrate addhost.php to lnms device:add
Have snmp-scan.py call lnms device:add (make exit codes line up so this works)
Fix issue with ping only devices trying to detect os via snmp
Reorder options in device:add help and improve formatting
Update docs to remove references to addhost.php
Fix a bit of code that was in functional code

* fixes

* fix snmp version message

LibreNMS/Device/YamlDiscovery.php

@@ -33,6 +33,7 @@ use LibreNMS\Config;
 use LibreNMS\Exceptions\InvalidOidException;
 use LibreNMS\Interfaces\Discovery\DiscoveryItem;
 use LibreNMS\OS;
+use LibreNMS\Util\Compare;
 
 class YamlDiscovery
 {
@@ -352,7 +353,7 @@ class YamlDiscovery
                     }
                 }
 
-                if (compare_var($tmp_value, $skip_value['value'], $op)) {
+                if (Compare::values($tmp_value, $skip_value['value'], $op)) {
                     return true;
                 }
             }