Prepend docker image to both stderr and stdout
Prepend docker image to both stderr and stdout

Sometimes, it may be hard to debug which distro produced an error, this
commit ensures that both stderr and stdout get piped through sed.

Change-Id: I16dd725b0c98599867892801c7146c4fe60f46e1
Reviewed-on: http://gerrit.cloudera.org:8080/12861
Reviewed-by: Tim Armstrong <2f8e34250f03a653da3dc27f7ec203eafdde80fc@cloudera.com>
Tested-by: Tim Armstrong <2f8e34250f03a653da3dc27f7ec203eafdde80fc@cloudera.com>

cloudera/native-toolchain,timarmstrong/native-toolchain,cloudera/native-toolchain,cloudera/native-toolchain