ospfsock: Wait for the socket answer

The error handling is horrible though.

birdvisu/ospfsock.py

@@ -3,6 +3,7 @@
 from dataclasses import dataclass,field
 import socket as sk
 from string import digits
+from select import select
 
 class BirdError(Exception):
 	def __init__(self, code, where, text):
@@ -55,6 +56,10 @@ class BirdSocketConnection:
 		code : str | None = None # string because of leading zeroes, and it has no numeric interpretation anyway
 		start = None
 		cont = True
+		# The response might not yet be ready
+		rrdy, wrdy, xrdy = select([self.socket], [], [], 1)
+		if len(rrdy) == 0:
+			print('WTF, no response in 1 second?')
 		f = self.socket.makefile('r')
 		for i, line in enumerate(f, start=1):
 			assert cont, "WTF bad format (should not continue)."