Refactor DHT bootstrap code

- Separate node list loading from connecting
- Put code in its own source file
- Rename a few functions

Makefile

@@ -14,7 +14,7 @@ LDFLAGS = $(USER_LDFLAGS)
 OBJ = chat.o chat_commands.o configdir.o execute.o file_transfers.o notify.o
 OBJ += friendlist.o global_commands.o groupchat.o line_info.o input.o help.o autocomplete.o
 OBJ += log.o misc_tools.o prompt.o settings.o toxic.o toxic_strings.o windows.o message_queue.o
-OBJ += group_commands.o term_mplex.o avatars.o name_lookup.o qr_code.o
+OBJ += group_commands.o term_mplex.o avatars.o name_lookup.o qr_code.o bootstrap.o
 
 # Check on wich system we are running
 UNAME_S = $(shell uname -s)