tf-ci-gateway/generate_report.sh: Enable gen_merge_report.sh unconditionally

Now that gen_merge_report.sh is known to work on OpenCI too.

This patch also enabled shell tracing to help with monitoring merged report
generation.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Ibc423d35947ff1133225ead425f919f09a68259f
1 file changed