Don't echo command from run_and_expect_silence. (#2405)
Don't echo command from run_and_expect_silence. (#2405)

Some commands, like our errcheck command, are very long. When we echo these both
before and after running them, it can obscure what is often a single-line
failure message. Removing the echo after failure makes it easier to spot the
real failure message.
letsencrypt/boulder,letsencrypt/boulder,jfrazelle/boulder,sophie-h/boulder,ZCloud-Firstserver/boulder,jsha/boulder,ibukanov/boulder,bmw/boulder,jcjones/boulder,jcjones/boulder,jsha/boulder,ibukanov/boulder,sophie-h/boulder,jfrazelle/boulder,jfrazelle/boulder,lucasallan/boulder,ZCloud-Firstserver/boulder,ZCloud-Firstserver/boulder,bmw/boulder,bmw/boulder,lucasallan/boulder,ZCloud-Firstserver/boulder,jsha/boulder,letsencrypt/boulder,jcjones/boulder,jfrazelle/boulder,ibukanov/boulder,lucasallan/boulder,sophie-h/boulder,jcjones/boulder