utils/test-pkg: log the output of merge-config
Currently, the stdout is consigned to oblivion, while the stderr is not
redirected at all. So, when the configuration under test redefines a
symbol, like is the case when testing busybox for example, there is an
ugly warning.
So, just redirect both stdout and stderr to the logfile.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 2664022787eb396125b5696a2d42c460ef54d359)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>