automated/linux/gst-validate: Don't use tee only redirect output

Lava-dispatcher slows the execution when is too many output ([1] vs [2])
in the stdout so only redirect to a file in order to speed-up, same in
piglit related to rev 36daa3ece5.

[1] https://validation.linaro.org/scheduler/job/1776006
[2] https://validation.linaro.org/scheduler/job/1794400

Change-Id: I8aa0d43b43362765946f9e4b2c89a507ea223e69
Signed-off-by: Aníbal Limón <anibal.limon@linaro.org>
diff --git a/automated/linux/gst-validate/gst-validate.yaml b/automated/linux/gst-validate/gst-validate.yaml
index 7a3e765..75dfe77 100644
--- a/automated/linux/gst-validate/gst-validate.yaml
+++ b/automated/linux/gst-validate/gst-validate.yaml
@@ -42,6 +42,6 @@
         -     git clone -b ${GST_IGNORE_TESTS_BRANCH} ${GST_IGNORE_TESTS_REPO} $repo_path
         -     IGNORE_FILE=${repo_path}/${GST_IGNORE_TESTS_FILE}
         - fi
-        - gst-validate-launcher -M ${MAIN_DIR} ${OPTIONS} 2>&1 | tee ./gst-validate-raw.log
+        - gst-validate-launcher -M ${MAIN_DIR} ${OPTIONS} > ./gst-validate-raw.log || true
         - ./gst_validate_lava_parse.py ./gst-validate-raw.log ${IGNORE_FILE} > ./result.txt
         - ../../utils/send-to-lava.sh ./result.txt