Downgrade token auth JWT logging from error to info
Downgrade token auth JWT logging from error to info

The token auth package logs JWT validation and verification failures at
the `error` level.  But from the server's perspective, these aren't
errors.  They're the expected response to bad input.  Logging them at
the `info` level better reflects that distinction.

Signed-off-by: Noah Treuhaft <dbef203116614531c8316cf6ccbd74e334f42129@docker.com>

mbentley/distribution,sergeyfd/distribution,nwt/distribution,RichardScothern/distribution,harrisonfeng/distribution,jwhonce/distribution,manoj535/distribution,cezarsa/distribution,sadlil/distribution,huamai-io/distribution,RichardScothern/distribution,cezarsa/distribution,estesp/distribution,huamai-io/distribution,duglin/distribution,konstruktoid/distribution,estesp/distribution,shyr/distribution,konstruktoid/distribution,mikebrow/distribution,mbentley/distribution,thaJeztah/distribution,shyr/distribution,duglin/distribution,sergeyfd/distribution,nwt/distribution,spacexnice/distribution,jzwlqx/distribution,sadlil/distribution,dmcgowan/distribution,manoj535/distribution,yuwaMSFT2/distribution,thaJeztah/distribution,jzwlqx/distribution,spacexnice/distribution,miminar/distribution,yuwaMSFT2/distribution,docker/distribution,vdemeester/distribution,dmcgowan/distribution,vdemeester/distribution,konnase/distribution,mikebrow/distribution,dobril-stanga/distribution,dobril-stanga/distribution,konnase/distribution,jwhonce/distribution,docker/distribution,harrisonfeng/distribution,miminar/distribution