get the correct name from the routerboard and replace all special characters with _

plugins/router/mikrotik_system

@@ -67,7 +67,7 @@ printf '( exit %q )' "$ret" >&2;
 function get_name {
   while read -r line; do
     if echo "$line" | grep -q 'name:'; then
-      name=$(echo "$line" | grep name: | awk '{ print $2 }')
+      name="$(echo "$line" | grep -E '\s+name:' | cut -f2 -d: | sed 's/^ *//g' | sed 's/[^A-Za-z0-9]/_/')"
     fi
   done <<< "$data"
 }