Allow multiple private keys but use the latest one #1910

Job	Run time
build-base-image	13m 13s
make-date-tag	1s
build-server-images (cache)	5m 40s
build-server-images (origin)	4m 48s
build-server-images (director)	4m 58s
build-server-images (registry)	4m 48s
build-server-images (osdf-cache)	4m 54s
build-server-images (osdf-origin)	5m 1s
build-server-images (osdf-director)	5m 17s
build-server-images (osdf-registry)	4m 49s
	53m 29s

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