integration-cli: remove timeout dependency on TestEventsUntag

TestEventsUntag requires a `timeout` command which does not
exist on OS X or Windows (in fact, windows has a totally different
timeout program and this test was accidentally using it).

- Created runCommandWithOutputForDuration.
  This entirely replaces runDockerCommandWithTimeout and
  removes dependency to `timeout` command.
- Made runDockerCommandWithTimeout reuse runDockerCommandForDuration.

TestEventsUntag works now on Windows.

Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>