Remove detectors

[ldelossa]

Closes milestone: #745

Removes detectors from AncestryGet rpc call. Response is now:

{
  "ancestry": {
    "name": "test-ancestry",
    "layers": [
      {
        "layer": {
          "hash": "8e674ad76dcef6f6d0398bc25550f680f8751876064a87a15347f00687492090"
        }
      }
    ]
  }
}

[jzelinskie]

We still need the status so that clients can determine when they need to rescan something.

[ldelossa]

👍

[ldelossa]

@jzelinskie

  "ancestry": {
    "name": "test-ancestry",
    "layers": [
      {
        "layer": {
          "hash": "8e674ad76dcef6f6d0398bc25550f680f8751876064a87a15347f00687492090"
        }
      }
    ]
  },
  "status": {
    "detectors": [
      {
        "name": "apk",
        "version": "1.0",
        "dtype": "DETECTOR_D_TYPE_FEATURE"
      },
      {
        "name": "dpkg",
        "version": "1.0",
        "dtype": "DETECTOR_D_TYPE_FEATURE"
      },
      {
        "name": "rpm",
        "version": "1.0",
        "dtype": "DETECTOR_D_TYPE_FEATURE"
      },
      {
        "name": "apt-sources",
        "version": "1.0",
        "dtype": "DETECTOR_D_TYPE_NAMESPACE"
      },
      {
        "name": "lsb-release",
        "version": "1.0",
        "dtype": "DETECTOR_D_TYPE_NAMESPACE"
      },
      {
        "name": "os-release",
        "version": "1.0",
        "dtype": "DETECTOR_D_TYPE_NAMESPACE"
      },
      {
        "name": "redhat-release",
        "version": "1.0",
        "dtype": "DETECTOR_D_TYPE_NAMESPACE"
      },
      {
        "name": "alpine-release",
        "version": "1.0",
        "dtype": "DETECTOR_D_TYPE_NAMESPACE"
      }
    ],
    "last_update_time": "2019-07-03T21:41:56.000Z"
  }
}```

updated api output. 

[jzelinskie]

LGTM if you squash the last two commits into one.

[ldelossa]

@jzelinskie squashed.

[ldelossa]

@jzelinskie should be good to go. Added .clang-format, make targets for proto linting and jsonnet compilation. CI passing.

[jzelinskie]

1 final change

[jzelinskie]

I think we should make this drone jsonnet --stream since that's what their documentation says to use.