log information should be issued to stderr not to stdout

[loloicci]

some information log is issued to stdout in some scripts. For example

tutorials/localnet/single/start.sh

Line 20 in 09535e1

echo "Using temporary dir $TMP_DIR"

.

It should be redirected to stderr.

[zemyblue]

This log helps to check runtime log.
It is very useful in error case. But we can also check and do monitoring in normal case.
So I think it is necessary.

[loloicci]

I think it is necessary.

My opinion is not discarding this log, but redirecting to stderr.