Provisioning was failing and the logs did not provide any useful
information because of the silenced squish install command. So I went
through all the scripts and I re-enabled stderr logging where I found it
silenced (with the exception of where it was purposeful or harmless).
Change-Id: I5fa0b0ba4362970b214c150d399b6720b1780e1e
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@qt.io>