perform blacklist before address switch
this commit adds the blacklist check before address switch
in the next step the old blacklist check has to be removed


git-svn-id: https://gnunet.org/svn/gnunet@31935 140774ce-b5e7-0310-ab8b-a85725594a96
- state-feature fix
- minor refactorings

git-svn-id: https://gnunet.org/svn/gnunet@31936 140774ce-b5e7-0310-ab8b-a85725594a96