tests/test-wireproto.py.out

chg: check lockfd at freecmdserveropts

We check for sockdirfd at freecmdserveropts but not lockfd, which is a bit
strange to people new to the code. Add a comment and an assert to make it
clear that lockfd should be closed earlier.

Hello, Foobar
['Hello, Fo, =;:<o', 'Hello, Bar']