devtool: use straight print in check-upgrade-status output

'devtool check-upgrade-status' is for reporting upgradable
status for recipes. The output should always be printed out. So
we should just use 'print' instead of 'logger.info' as the latter
will be suppressed if '-q' parameter is supplied to devtool.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>