Add kubernetes as Provider

[ShubhamRasal]

As similar to other provider, add kubernetes as a provider.

Add ability to output:

• Service IP address from all the namespace
• Ingress rules from all the namespace

In the config file,

- # provider is the name of the provider
  provider: k8s OR kubernetes
  #  id is the name defined by user for filtering (optional)
  id: dev_cluster
  kubeconfig_file:  <location-of-kubeconfig>
  context: <name of context>