Move Dockerfile in docker directory
Add a stdout handler for subprocess while testing

* As we can't sneak in the process to add the handler to fetch warnings and
  errors, use another LOG_CFG for testing which set the default level on
  stdout as warning.
* Remove the on test_basics_cli the first INFO message, which corresponds to
  inform which level setting was set.
Increase timeout for very slow testing network.
Better timeouting on installing tests

* Do not give a deadline for installing time. Instead, just raise a
  timeout expection, if the output is stalled for the timeout time.
  This value is optional and by default, it's the pexpect timeout time which
  is used (30s).