Copy files to and from a pod

[dservgun]

Copying files to and from a pod. Use example as a reference. Essentially the exec call needs to be used to copy binaries or files to and from the pod. When would we need this: for example if one needs to deploy certificates, exes to the pod. There is no rest api call to enable an application to effect that.

Notes:

Security can become an issue if the client is sending large files across the pod. There needs to be checks around the file sizes as well as split and merge across the pods.