Implement missing Chef 12 endpoints

[andrewjamesbrown]

The following CS12 endpoints are currently unimplemented in Chef Zero, which makes the build fail. Currently it is worked around by explicitly disabling them, which should be enabled once the endpoints are working.

'--skip-policies',
'--skip-server-api-version',
'--skip-cookbook-artifacts',
'--skip-containers',
'--skip-api-v1'

[marcparadise]

I'm going to split --skip-api-vi into its own thing, since there's a fair bit of work there - we'll need support API versioning as a whole, since that's how we're introducing modified functionality into the API. I'll set up a separate issue for it

[tyler-ball]

api-v1 - #154

[andrewjamesbrown]

I've fixed --skip-server-api-version in #155, which also has the beginnings of fixes for #154

[andrewjamesbrown]

It looks like @danielsdeleo fixed cookbook-artifacts in #112 but that PR will need to be rebased and tests passing.

[thommay]

the only missing chef 12 endpoint now is /universe.