scripts/oe-{self,}test: Logger change default stream to stdout
By default python logging module uses stderr as default stream
for output but is unix-like to use stdout instead, so change it.
(From OE-Core rev: 986452c410a958e339f31f8c05461c18a1a15eb5)
Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>