Allow using ec2 roles when specifying region endpoint
Allow using ec2 roles when specifying region endpoint

Signed-off-by: Lloyd Ramey <654c49ce7fd8d61cd7cc3b4590f3bca866182283@gmail.com>

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