[3732b] Removed TODO (likely more than obsolete)

src/lib/config/TODO

@@ -1,8 +0,0 @@
-Open issues for lib/config:
-
-* Error output currently goes to stdout, and we need to use
-  decent logging for that.
-* Add "expect failure" tests to the unit tests.
-* This cpp version does not use recvmsg() with a sequence number to
-  prevent other messages sneaking in before the answer it expects.
-  (because lib/cc/session.cc|h does not support that yet).