Allowing to forward other hosts than localhost to Kubernetes.

Usage

• ktunnel expose mynginx 8080:nginx:80 to forward all requests targeted at mynginx:8080 inside K8s to another host nginx:80.
• If no hostname is provided, it uses localhost to preserve the current behaviour.

Testing

Tested it in combination with docker-compose to create a reproducable testing environment.

Dockerfile:

FROM dtzar/helm-kubectl:latest
COPY test/ktunnel /usr/local/bin

docker-compose.yml:

version: '3.3'
services:
  tunnel: # Creates K8s service mynginx:8080 and forwards all traffic to nginx:80
    build: .
    volumes:
      - /home/xxx/.kube/config:/root/.kube/config:ro
    command:
      - 'bash'
      - '-c'
      - 'ktunnel expose mynginx 8080:nginx:80'
  nginx: # Runs on Port 80
    image: nginx

Hi @omrikiei,
I tried my luck implementing #108. Could you have a look on this MR? Always open for change requests 😃.

Closes #108