Allow multiple private keys but use the latest one #1914

Job	Run time
build-base-image	11m 25s
make-date-tag	1s
build-server-images (cache)	7m 16s
build-server-images (origin)	5m 14s
build-server-images (director)	5m 17s
build-server-images (registry)	6m 5s
build-server-images (osdf-cache)	6m 5s
build-server-images (osdf-origin)	5m 11s
build-server-images (osdf-director)	7m 15s
build-server-images (osdf-registry)	5m 21s
	59m 10s

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