Merge #468: Replace deprecated tostring with tobytes

00315c8 Replace deprecated tostring with tobytes (Carl Dong)

Pull request description:

  Upstream: bitcoin/bitcoin#13963

Tree-SHA512: 667cb8799941e7c3a567e8c9b77b77fdf1b838d170b5de2c51618e6d1284216039cb39e44f9650b6a7de325036a0d2c80aeb9cf5387da7e183f33461a31c9727

Author: instagibbs

test/bitcoin_functional/functional/test_framework/netutil.py

@@ -107,7 +107,7 @@ def all_interfaces():
             max_possible *= 2
         else:
             break
-    namestr = names.tostring()
+    namestr = names.tobytes()
     return [(namestr[i:i+16].split(b'\0', 1)[0],
              socket.inet_ntoa(namestr[i+20:i+24]))
             for i in range(0, outbytes, struct_size)]

test/functional/test_framework/netutil.py

@@ -107,7 +107,7 @@ def all_interfaces():
             max_possible *= 2
         else:
             break
-    namestr = names.tostring()
+    namestr = names.tobytes()
     return [(namestr[i:i+16].split(b'\0', 1)[0],
              socket.inet_ntoa(namestr[i+20:i+24]))
             for i in range(0, outbytes, struct_size)]