jenkins/build-config.jpl: drop use of tee()

Some buf reports indicate that parallel + tee()
doesn't quite work reliably:

https://issues.jenkins-ci.org/browse/JENKINS-63504
https://issues.jenkins-ci.org/browse/JENKINS-37575

Test if moving tee to shell removes the never ending
jobs observed in tf-m-nightly builds.

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Change-Id: I3d5cc972d0b9d6073d66278a771bf000497bbc33
1 file changed