Revert "[tests] bind functional test nodes to 127.0.0.1"

This reverts commit 65682da.

Author: jnewbery

test/functional/test_framework/util.py

@@ -292,7 +292,6 @@ def initialize_datadir(dirname, n):
         f.write("port=" + str(p2p_port(n)) + "\n")
         f.write("rpcport=" + str(rpc_port(n)) + "\n")
         f.write("listenonion=0\n")
-        f.write("bind=127.0.0.1\n")
     return datadir
 
 def get_datadir_path(dirname, n):