core - update docker image with multi-cloud packages, py3 base, image metadata (#3336)
core - update docker image with multi-cloud packages, py3 base, image metadata (#3336)


thisisshi/cloud-custodian,thisisshi/cloud-custodian,kapilt/cloud-custodian,ocampocj/cloud-custodian,kapilt/cloud-custodian,thisisshi/cloud-custodian,ocampocj/cloud-custodian,Sutto/cloud-custodian,ewbankkit/cloud-custodian,Sutto/cloud-custodian,kapilt/cloud-custodian,Sutto/cloud-custodian,Sutto/cloud-custodian,ewbankkit/cloud-custodian,ocampocj/cloud-custodian,FireballDWF/cloud-custodian,FireballDWF/cloud-custodian,ewbankkit/cloud-custodian,capitalone/cloud-custodian,ewbankkit/cloud-custodian,alfredgamulo/cloud-custodian,alfredgamulo/cloud-custodian,capitalone/cloud-custodian,FireballDWF/cloud-custodian,capitalone/cloud-custodian,kapilt/cloud-custodian,capitalone/cloud-custodian,ocampocj/cloud-custodian,alfredgamulo/cloud-custodian,FireballDWF/cloud-custodian