test: Output stderr of `flynn-host ps` when dumping logs
test: Output stderr of `flynn-host ps` when dumping logs

The command sometimes hangs in CI, so we want to be able to see the
output when sending SIGQUIT.

Signed-off-by: Lewis Marshall <748e1641a368164906d4a0c0e3965345453dcc93@lmars.net>

benbjohnson/flynn,tonicbupt/flynn,arekkas/flynn,pkdevbox/flynn,josephglanville/flynn,flynn/flynn,arekkas/flynn,arekkas/flynn,benbjohnson/flynn,shads196770/flynn,benbjohnson/flynn,flynn/flynn,TribeMedia/flynn,felixrieseberg/flynn,technosophos/flynn,lmars/flynn,whouses/flynn,supermario/flynn,justintung/flynn,ozum/flynn,arekkas/flynn,jzila/flynn,justintung/flynn,kgrz/flynn,TribeMedia/flynn,GrimDerp/flynn,pkdevbox/flynn,ozum/flynn,ozum/flynn,ozum/flynn,GrimDerp/flynn,schatt/flynn,felixrieseberg/flynn,benbjohnson/flynn,philiplb/flynn,philiplb/flynn,josephglanville/flynn,justintung/flynn,justintung/flynn,shads196770/flynn,benbjohnson/flynn,arekkas/flynn,TribeMedia/flynn,ozum/flynn,shads196770/flynn,flynn/flynn,technosophos/flynn,clifff/flynn,whouses/flynn,pkdevbox/flynn,schatt/flynn,kgrz/flynn,pkdevbox/flynn,shads196770/flynn,shads196770/flynn,GrimDerp/flynn,felixrieseberg/flynn,clifff/flynn,rikur/flynn,Brandywine2161/flynn,jzila/flynn,schatt/flynn,supermario/flynn,felixrieseberg/flynn,josephglanville/flynn,schatt/flynn,technosophos/flynn,lmars/flynn,josephglanville/flynn,philiplb/flynn,shads196770/flynn,technosophos/flynn,josephglanville/flynn,whouses/flynn,schatt/flynn,lmars/flynn,supermario/flynn,rikur/flynn,Brandywine2161/flynn,lmars/flynn,tonicbupt/flynn,GrimDerp/flynn,justintung/flynn,felixrieseberg/flynn,TribeMedia/flynn,pkdevbox/flynn,GrimDerp/flynn,ozum/flynn,TribeMedia/flynn,rikur/flynn,jzila/flynn,Brandywine2161/flynn,kgrz/flynn,philiplb/flynn,supermario/flynn,GrimDerp/flynn,kgrz/flynn,supermario/flynn,rikur/flynn,TribeMedia/flynn,pkdevbox/flynn,clifff/flynn,whouses/flynn,tonicbupt/flynn,rikur/flynn,clifff/flynn,clifff/flynn,kgrz/flynn,flynn/flynn,technosophos/flynn,Brandywine2161/flynn,josephglanville/flynn,kgrz/flynn,Brandywine2161/flynn,clifff/flynn,jzila/flynn,jzila/flynn,tonicbupt/flynn,schatt/flynn,Brandywine2161/flynn,flynn/flynn,rikur/flynn,jzila/flynn,supermario/flynn,tonicbupt/flynn,whouses/flynn,philiplb/flynn,lmars/flynn,benbjohnson/flynn,justintung/flynn,whouses/flynn