Revert change to set redirect_stderr=True.
Revert change to set redirect_stderr=True.

On Ubuntu Precise, it is not possible to keep around sudo authentication that
is unattached to a TTY. If you run sudo twice without a TTY, it'll ask for a
password every time. If you try to run 'sudo -n', it won't work.

To work around this, set redirect_stderr=False again because this change was
what broke Precise users.

BUG=chromium-os:33686
TEST=Verify that cros_sdk works again on Ubuntu precise.

Change-Id: Ibed11dd7036e3fcbd7e57bcf924db7a548edb2d6
Reviewed-on: https://gerrit.chromium.org/gerrit/30907
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>

zhang0137/chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,coreos/chromite,coreos/chromite,zhang0137/chromite,chadversary/chromiumos.chromite,coreos/chromite,zhang0137/chromite,chadversary/chromiumos.chromite