Add messaging to __ssh_authorized_key. (#590)

cdist/conf/type/__ssh_authorized_key/gencode-remote

@@ -111,8 +111,10 @@ fi
 case "$state_should" in
    present)
       add_line "$file" "$entry"
+      echo "added to $file ($entry)" >> "$__messages_out"
    ;;
    absent)
       remove_line "$file" "$entry"
+      echo "removed from $file ($entry)" >> "$__messages_out"
    ;;
 esac

cdist/conf/type/__ssh_authorized_key/man.rst

@@ -36,6 +36,15 @@ state
    if the given keys should be 'present' or 'absent', defaults to 'present'.
 
 
+MESSAGES
+--------
+added to `file` (`entry`)
+   The key `entry` (with optional comment) was added to `file`.
+
+removed from `file` (`entry`)
+   The key `entry` (with optional comment) was removed from `file`.
+
+
 EXAMPLES
 --------