implement messaging for __group type

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

cdist/conf/type/__group/gencode-remote

@@ -58,10 +58,12 @@ if grep -q "^${name}:" "$__object/explorer/group"; then
 
       if [ "$new_value" != "$current_value" ]; then
          set -- "$@" "$proparg" \"$new_value\"
+         echo change $property $new_value $current_value >> "$__messages_out"
       fi
    done
 
    if [ $# -gt 0 ]; then
+      echo mod >> "$__messages_out"
       case $os in
          freebsd)
             echo pw group mod "$@" "$name"
@@ -72,6 +74,7 @@ if grep -q "^${name}:" "$__object/explorer/group"; then
       esac
    fi
 else
+   echo add >> "$__messages_out"
    for property in $(ls .); do
       new_value="$(cat "$property")"
       if [ "$os" = "freebsd" ]; then
@@ -95,6 +98,7 @@ else
       fi
 
       set -- "$@" "$proparg" \"$new_value\"
+      echo set $property $new_value >> "$__messages_out"
    done
 
    case $os in