Import vtun.drivers, add an autogen.sh script to create autoconf files

.gitignore

@@ -0,0 +1,21 @@
+*.o
+*~
+Makefile
+autom4te.cache
+cfg_file.lex.c
+cfg_file.tab.c
+cfg_file.tab.h
+config.guess
+config.h
+config.h.in
+config.log
+config.status
+config.sub
+configure
+install-sh
+pipe_dev.c
+pty_dev.c
+tap_dev.c
+tcp_proto.c
+tun_dev.c
+udp_proto.c