PUBAPI-938 - don't log excessively when a user fails auth, at least for signature auth.
PUBAPI-938 - don't log excessively when a user fails auth, at least
for signature auth.

arekinath/sdc-cloudapi,misterbisson/sdc-cloudapi,joyent/sdc-cloudapi,KrisShannon/sdc-cloudapi,arekinath/sdc-cloudapi,misterbisson/sdc-cloudapi,KrisShannon/sdc-cloudapi,joyent/sdc-cloudapi