commit 91f7da2c8b6d5a927c9d4ec113aa7997b009aeb1
author Todd Wang <toddw@google.com> Wed Jan 06 14:27:51 2016 -0800
committer Todd Wang <toddw@google.com> Wed Jan 06 14:27:54 2016 -0800
tree 8f30549d49f6b25e4b5a3c76e262acfd8453f453
parent bc0513dbe7a86e9442987d33526120e86e3e0964

gosh: Add Cmd.CombinedOutput, and simplify stdout/stderr ordering

The Cmd.CombinedOutput method works like the exec.CombinedOutput
method; it returns the combined stdout/stderr, in the order they
were written.

The simplification to stdout/stderr ordering is to always make
writes to stdout and stderr writers synchronous, regardless of
whether we have the same underlying writers capturing both of
them.  This also has the nice property of ensuring that multiple
writers that capture both stdout and stderr will always see the
results in the same order.

Change-Id: Ib2b15092d3bd9d1566d98487965336c1d1c67aca