py3: suppress the output of .write() calls in tests/test-revlog-v2.t
This makes the test pass on Python 3.
Differential Revision: https://phab.mercurial-scm.org/D3785
py3: add couple of missing b'' prefixes in tests/test-pager-legacy.t
# skip-blame because just b'' prefixes
Differential Revision: https://phab.mercurial-scm.org/D3784