Some redirected output is not preserved on verify job

[nashif]

Reported by Genaro Saucedo Tejada: When we redirect STDERR and STDOUT to log files in order to process it later, specifically filter known issues, we are not showing raw data on Jenkins log.

As a result we are missing some information related to failures, making hard to reproduce errors and impossible to diagnose errors with just the Jenkins log.

All logs have to be preserved on CI, event those redirected to temporal files for intermediate steps.

Alternatives to fix this issue compiled so far are:

• Archive al temporary files explicitly on archive file server
• Always ensure logs are "cat" to STDOUT
• Use "tee"

(Imported from Jira INF-38)

[nashif]

by Genaro Saucedo Tejada:

This is covered by Inaky Perez-Gonzalez on his refactor https://gerrit.zephyrproject.org/r/#/c/9762/