Upgrade to deployment.apps and rancher 2.2

Since rancher server v2.2. the deployments are somehow not called "deployment" but "deployment.apps" anymore. This tag is an upgraded version of the script to cope with this.

Rancher-CLI v2.0.4 integreted

Merge pull request #4 from GitRon/master

Dockerfile adjusted to use rancher-cli v2.0.4

Use standard login process

We used to work around the standard rancher CLI login call by writing the cli2.json file manually. This was necessary in times where the "--context" option was missing in the rancher login command. Now this is possible and our work around is not necessary anymore.