Refactor DHT bootstrap code

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

src/bootstrap.h

@@ -0,0 +1,32 @@
+/*  bootstrap.h
+ *
+ *
+ *  Copyright (C) 2014 Toxic All Rights Reserved.
+ *
+ *  This file is part of Toxic.
+ *
+ *  Toxic is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Toxic is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Toxic.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/* Manages connection to the Tox DHT network. */
+void do_tox_connection(Tox *m);
+
+/* Load the DHT nodelist to memory.
+ *
+ * Return 0 on success.
+ * Return -1 if nodelist file cannot be opened.
+ * Return -2 if nodelist file does not contain any valid node entries.
+ */
+int load_DHT_nodelist(void);