# Functions
FileReader returns a CmdReader that reads the current contents of path on pod.file
It returns io.EOF at the end of the file.
NewReader starts an exec.Cmd and returns a Reader for its stdout.
NewWriter starts an exec.Cmd and returns an io.WriteCloser for its stdin.
PodWrite is a shortcut for NewPodWriter(), Write(), Close().
PodWriter returns an io.WriteCloser that appends to a file in a pod container.
TailReader returns a CmdReader that tails file at path on pod.
TailReaderForContainer returns a CmdReader that tails file at path on pod.