TUN-3019: Remove declarative tunnel entry code

vendor/zombiezen.com/go/capnproto2/CONTRIBUTORS

@@ -18,6 +18,7 @@
 Alan Braithwaite <alan@cloudflare.com>
 Albert Strasheim <albert@cloudflare.com>
 Daniel Darabos <darabos.daniel@gmail.com>
+Dominik Roos <domi.roos@gmail.com>
 Eran Duchan <pavius@gmail.com>
 Evan Shaw <edsrzf@gmail.com>
 Ian Denhardt <ian@zenhack.net>
@@ -26,8 +27,13 @@ Jason E. Aten <j.e.aten@gmail.com>
 Johan Hernandez <im@bithavoc.io>
 Joonsung Lee <joonsung@devsisters.com>
 Lev Radomislensky <lev.radomislensky@gmail.com>
+Lukas Vogel <vogel@anapaya.net> <lukedirtwalker@gmail.com>
+Martin Sucha <martin.sucha@kiwi.com>
 Peter Waldschmidt <peterw@gnoso.com>
 Ross Light <light@google.com> <ross@zombiezen.com>
+Stephen Shirley <kormat@anapaya.net> <kormat@gmail.com>
+Tiit Pikma <pikma@hot.ee>
 Tom Thorogood <me+github@tomthorogood.co.uk>
 TJ Holowaychuk <tj@apex.sh>
 William Laffin <william.laffin@gmail.com>
+Colin Arnott <colin@urandom.co.uk>