py3: call hgweb.hgweb() with bytes values
# skip-blame because just b'' prefixes
I believe this should fix some tests.
Differential Revision: https://phab.mercurial-scm.org/D4594
## Avoid interference from actual test env:unset HGTEST_JOBSunset HGTEST_TIMEOUTunset HGTEST_PORTunset HGTEST_SHELL