buildbot/buildbot — pull request #1288 by delanne (2014-10-24 09:55:19+00:00)
Title: Fix: step.ShellSequence doesn't catch stdout/stderr even if the paramete...

...rs want_stdout/want_stderr are set to True.

Note:
- here's a example how to catch stderr/stdout with this patch applied
```
factory.addStep(steps.ShellSequence(name="BuildSandBox",
want_stdout=True,
want_stderr=True,
commands=[util.ShellArg(command=['rm', '-rf', 'sandbox'],
logfile="rm",),
util.ShellArg(command=['make', 'buildsandbox', 'args="sandbox"'],
logfile="sandbox",),]))
```