Extract log utils into pkg/log

Docker-DCO-1.1-Signed-off-by: Josiah Kiehl <josiah@capoferro.net> (github: capoferro)
move utils.Fataler to pkg/log.Fataler

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #7569 from erikh/pkg_log

Cleanup: Extract log utils into pkg/log