Fixup for 17b665d5:  remove 'sleep' hack & fix race condition in tests

17b665d5 was a failed attempt to hack around a race condition by
lengthening a 'sleep'; this simply made the problem appear less
frequently.

The problem only occurred in the toolchanger/toolno-pocket-differ/*
tests.  Comparing with other successful linuxcncrsh-based tests turned
up 9748fe92 and the "set wait done" command, which clears up the
problem, even with the original 'sleep' hack removed.
tests/bitops.0/test.sh:  change include dir to /include from /src/rtapi

Theory:  tests ought not to depend on anything in /src/
FIXME:  temp. don't kill realtime.in to debug a msgd hang

Instead get a gdb back trace and then hang forever.