Define route, endpoint and service for kubernetes

[amha19]

Description

• Defines a kubernetes route and api endpoint that takes in a cluster id.
• It defines getter method for the route and the api.
• Creates a fetch method and fetch response processing method.

Given this:

[
  {
    name: 'tele.logicoma.dev-prod',
    tags: [
      { name: 'kernal', value: '4.15.0-51-generic' },
      { name: 'env', value: 'prod' },
    ],
  },
]

Will output this:

[
  {
    name: 'tele.logicoma.dev-prod',
    tags: [ 'kernal: 4.15.0-51-generic', 'env: prod' ],
  },
]

And it adds this service to the teleport context.

This PR closes #283

[kimlisa]

LGTM