Fix test.sh on shells without echo -n

Fix test.sh on shells without echo -n

Some systems have a version of /bin/sh whose builtin echo doesn't
support the -n option used in test/test.sh.  /bin/echo, however,
usually does.  This patch makes us use /bin/echo for echo -n whenever
it is present.

Also, our use of echo -n really only made sense when suppressing all
test output.  Since test output isn't suppressed when logging to a
file, this pach makes us stop using echo -n when logging to a file.