Without this fix, we see key update messages like this:

  Please take care of these keys for list test@x.mayfirst.org.

  Expires in 9 days:
  0xXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX test@example.comIs expired:
  0xYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY other@example.com

This avoids having each note strung together on a single line.