Revert r109283, r109282 and r109239.

Revert r109283, r109282 and r109239.

"Add callback support for stdout and stderr."
"Add tests for both universal_newlines=True and False."
"Implement accelerated tee support for POSIX."

The reason is that the semantic of
subprocess2.check_call(cmd, timeout=60, stderr=subprocess2.STDOUT) changed,
stderr wasn't redirected to VOID anymore and for an unknown reason, it was
hanging until the timeout happened. Will reapply r109239 with a new regression
test to detect that bug.

TBR=dpranke@chromium.org
BUG=
TEST=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=109369

[commit-bot: I haz the power, 2011-11-10 02:17:59]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/8505046/1

[commit-bot: I haz the power, 2011-11-10 02:23:44]

Change committed as 109369

[Dirk Pranke, 2011-11-10 02:25:17]

lgtm