bud.bats: log output before counting length
bud.bats: log output before counting length

Before checking the length of output, note the output value in the log,
to make troubleshootting easier.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

Closes: #1408
Approved by: rhatdan

projectatomic/buildah,nalind/buildah,TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah,rhatdan/buildah,TomSweeneyRedHat/buildah,nalind/buildah,nalind/buildah-1,rhatdan/buildah,nalind/buildah-1,projectatomic/buildah,projectatomic/buildah,nalind/buildah-1,rhatdan/buildah