deis doctor includes lots of k8s data

[jackfrancis]

This PR delivers the following feature additions:

• Deis doctor handler introspects the configured "deis" kubernetes namespace and generates a JSON-body POST request to the configured deis doctor API endpoint
• Kuberenetes data gathered and reported by deis doctor includes:
  • nodes
  • pods (namespaced to "deis")
  • daemonSets (namespaced to "deis")
  • deployments (namespaced to "deis")
  • events (namespaced to "deis")
  • replicaSets (namespaced to "deis")
  • replicationControllers (namespaced to "deis")
  • services (namespaced to "deis")
• Kubernetes data is gathered au totale by way of a swagger model property that eagerly JSON-encodes the entire source kubernetes resource data inside a data property. This makes for a predictably heavy-weight data payload, and in the future it may make sense to include some filtering. That, and any additional explicit properties data modeling is TODO.

Included in the implementation to support these features are the following under-the-hood items worth emphasizing:

• A new k8s sub-package was created to accommodate all new business logic responsible for gathering and preparing kubernetes cluster data; pre-existing kubernetes-specific implementations that were formerly in the data package were moved to k8s, as appropriate (e.g., the data.getRCItems() helper function becomes the exportable k8s.GetReplicationControllers().
• To support the new kubernetes-specific interfaces needed, the handy kubeapp dependency was updated, and in fact github.com/deis absorbed what was formerly @arschles's personal creation.
• glide.yaml and glide.lock updated to reflect updated kubeapp dependencies
• Zero-value k8s data mocks added to support very basic contract-abiding test interfaces, but actual mock data is TODO in a follow-up PR.
• Resource-specific interfaces added as light wrappers to aid the passing around of data and data specifications. In particular, the k8s.ResourceInterface is meant, with the help of its constructor, to conveniently provide a re-usable kubernetes-namespace-specific, per-resource data retrieval singleton.
• New, swagger-generated client stubs to support deis doctor k8s data.

[arschles]

moving out of the 2.2 milestone

[codecov-io]

Current coverage is 31.19% (diff: 38.15%)

Merging #81 into master will increase coverage by 5.25%

@@             master        #81   diff @@
==========================================
  Files             9          8     -1   
  Lines           343        359    +16   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits             89        112    +23   
+ Misses          235        220    -15   
- Partials         19         27     +8   

Powered by Codecov. Last update e010f7a...73bd54f

[jackfrancis]

Above-noted future TODO item for k8s mock data filed here:

• https://github.com/deis/workflow-manager/issues/85

[jackfrancis]

Above-noted future TODO for deis doctor data modeling filed here:

• https://github.com/deis/workflow-manager/issues/86

[mboersma]

I tested this by putting it into the workflow-dev chart. Resulted in a huge JSON blob full of the above information--good stuff!

[jackfrancis]

closes #79