Allow control over TLS version and ciphers for docker-registry #13260
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cherry-pick of #13258
Allows envvar-based control over tls version and ciphers for docker registry via envvars
Valid tls versions are "VersionTLS10", "VersionTLS11", "VersionTLS12"
Valid cipher suites are https://golang.org/pkg/crypto/tls/#pkg-constants for the golang version used to build origin, taken from descriptions of http://www.iana.org/assignments/tls-parameters/tls-parameters.xml#tls-parameters-4