Fix the message for debug mode in signer
Fix the message for debug mode in signer

Signed-off-by: Justin Cormack <af64ee19f04db9509cb02b0e470e11e5402ef9b3@docker.com>

endophage/notary,johnsandiford/notary,HuKeping/notary,jfrazelle/notary,docker/notary,johnsandiford/notary,jfrazelle/notary,endophage/notary,johnsandiford/notary,HuKeping/notary,HuKeping/notary,docker/notary,jfrazelle/notary,docker/notary,endophage/notary