client/stream: rely on callers for closing stdout and stderr
client/stream: rely on callers for closing stdout and stderr

Since we didn't open the resource, we should not be closing it. As
described in #385, that might break some existing code, so we can
rollback this change and take @gavrie's approach for preventing closure
of os.Stdout and os.Stderr.

Closes #385.

tarsisazevedo/go-dockerclient,achanda/go-dockerclient,tarsisazevedo/go-dockerclient,liron-l/go-dockerclient,davidstack/go-dockerclient,jefferai/go-dockerclient,fsouza/go-dockerclient,eliasgs/go-dockerclient,paulbellamy/go-dockerclient,bboreham/go-dockerclient,csrwng/go-dockerclient,csrwng/go-dockerclient,ybogdanov/go-dockerclient,ybogdanov/go-dockerclient,davidstack/go-dockerclient