refactor core modules, integrate network stats

http2.py

@@ -111,6 +111,15 @@ class RsHttp():
 	def get_last_rocksock_exception(self):
 		return self.last_rs_exception
 
+	def disconnect(self):
+		"""Safely close the underlying connection."""
+		if hasattr(self, 'conn') and self.conn:
+			try:
+				self.conn.disconnect()
+			except:
+				pass
+			self.conn = None
+
 	def _err_log(self, s):
 		if self.log_errors:
 			sys.stderr.write(s + '\n')