Log stderr in get_latest_image_version_deb()
Log stderr in get_latest_image_version_deb()

It was being suppressed needlessly. Also fix lots of linter issues.

Signed-off-by: Zack Cerza <d7cdf09fc0f0426e98c9978ee42da5d61fa54986@redhat.com>

caibo2014/teuthology,ivotron/teuthology,dmick/teuthology,dreamhost/teuthology,caibo2014/teuthology,robbat2/teuthology,ivotron/teuthology,ceph/teuthology,SUSE/teuthology,michaelsevilla/teuthology,ceph/teuthology,dmick/teuthology,zhouyuan/teuthology,SUSE/teuthology,t-miyamae/teuthology,t-miyamae/teuthology,ktdreyer/teuthology,SUSE/teuthology,robbat2/teuthology,zhouyuan/teuthology,dmick/teuthology,michaelsevilla/teuthology,dreamhost/teuthology,ktdreyer/teuthology