This aligns the autotools build with the cmake build, which doesn't have
a config.h file. It also removes the ambiguity of config.h and
other/bootstrap_daemon/src/config.h.
The test explicitly wanted a UDP connection when a TCP connection would suffice. This
was a remnant of back when the test was part of a multi-purpose autotest that
didn't attempt to connect to TCP relays and needed a UDP connection specifically.
This forces all the loop bodies to be executed at least once, which is
harmless since it just means one more tox event loop iteration. This
reduces the jitter we see in coverage measurements, which is partially
caused by loops sometimes being entered and sometimes not (because their
condition happens to randomly already be true).
