[lit] Fix order of checks in shtest-shell.py test

[lit] Fix order of checks in shtest-shell.py test

Summary:
An expectation in `utils/lit/tests/Inputs/shtest-shell/redirects.txt`
expects that first a string printed to stdout is seen, and then a
string printed to stderr. Add `flush()` calls to ensure that stdout is
printed before stderr, as expected.

Reviewers: rnk, mgorny, jroelofs

Reviewed By: rnk

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D35947

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309292 91177308-0d34-0410-b5e6-96231b3b80d8