Log when the DCO is invalid.
Log when the DCO is invalid.

Signed-off-by: David Calavera <b9b0c8e7f90ecf337f6797c4d2e0f1dd0dbc0324@gmail.com>

SvenDowideit/leeroy,jfrazelle/leeroy,docker/leeroy,SvenDowideit/leeroy,michaelneale/leeroy,docker/leeroy,mjbrender/leeroy,EIrwin/leeroy,michaelneale/leeroy,hawky-4s-/leeroy,Graylog2/leeroy,EIrwin/leeroy,jfrazelle/leeroy,hawky-4s-/leeroy,mjbrender/leeroy