Remove the assertions for connect

Because it fails in `test_security_multistream.py` and this check is
indeed not necessary inside `connect`.(Should probably be outside the
function.)

tests/utils.py

@@ -13,8 +13,6 @@ async def connect(node1, node2):
     addr = node2.get_addrs()[0]
     info = info_from_p2p_addr(addr)
     await node1.connect(info)
-    assert node1.get_id() in node2.get_network().connections
-    assert node2.get_id() in node1.get_network().connections
 
 
 async def cleanup():