Add kubernetes support

[arshbot]

Currently the only way to use lnt is to connect it to a port that forwards or is listened to by the lnd daemon. Ideally there would also be kube support so you could specific the:

context
namespace
pod
container

you'd like to access and run commands against. Accessing down to the container would run lncli commands in the container and remove the need to host sensitive information ( such as macaroons ) locally