remove external IP address from previous DNS lookup only after DNS lookup for new iteration has completed (#3213)

git-svn-id: https://gnunet.org/svn/gnunet@31377 140774ce-b5e7-0310-ab8b-a85725594a96
-doxygen, indentation

git-svn-id: https://gnunet.org/svn/gnunet@31379 140774ce-b5e7-0310-ab8b-a85725594a96
-simplify logic to help diagnose #2858

git-svn-id: https://gnunet.org/svn/gnunet@31380 140774ce-b5e7-0310-ab8b-a85725594a96
-ignore

git-svn-id: https://gnunet.org/svn/gnunet@31381 140774ce-b5e7-0310-ab8b-a85725594a96
-cleanup, doxygen

git-svn-id: https://gnunet.org/svn/gnunet@31382 140774ce-b5e7-0310-ab8b-a85725594a96