fixing 0003221: Crash in UDP broadcast: plugin_transport_udp_broadcasting.c:253. 


git-svn-id: https://gnunet.org/svn/gnunet@31504 140774ce-b5e7-0310-ab8b-a85725594a96
fix for fix


git-svn-id: https://gnunet.org/svn/gnunet@31505 140774ce-b5e7-0310-ab8b-a85725594a96
check for keep alive function while loading plugin


git-svn-id: https://gnunet.org/svn/gnunet@31506 140774ce-b5e7-0310-ab8b-a85725594a96
-pi can be slower than this (see build 1241)

git-svn-id: https://gnunet.org/svn/gnunet@31507 140774ce-b5e7-0310-ab8b-a85725594a96