[ADD] clouder_certificate_authority: Implement CA using CFSSL

[lasley]

This is a WIP - I still need to implement an interface to the CLI. I'm having a real helluva a time getting this to work the way I want though, so maybe you can help.

CFSSL isn't a service like everything else is, it's a CLI app that is going to be hosted in its own container. See the following console:

$ docker run -i -t lasley/cfssl-exec
Usage:
Available commands:
	serve
	ocspsign
	ocspserve
	selfsign
	bundle
	genkey
	gencert
	certinfo
	scan
	info
	print-defaults
	revoke
	version
	gencrl
	ocspdump
	ocsprefresh
	sign
Top-level flags:
  -allow_verification_with_non_compliant_keys
    	Allow a SignatureVerifier to use keys which are technically non-compliant with RFC6962.

I tried setting clouder.application.link.service to false, but that didn't seem to have any affect. Is what I'm looking to do supported? My stupid container just keeps restarting.

Every 2.0s: docker ps | grep cfssl                                                                                                                                                                                        Tue Dec 13 23:03:30 2016

28cac556cf41        dev-ssl-exec-20161214.070106                "cfssl --help"           2 minutes ago       Restarting (2) 33 seconds ago   0.0.0.0:31003->8888/tcp
               dev-ssl-exec

[codecov-io]

Current coverage is 31.08% (diff: 100%)

Merging #180 into master will not change coverage

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