[test] Add user-site to PYTHONPATH before installation of new cube in test_newcube_install
Otherwise, setuptools complains that the target installation directory (i.e.
"user site" is not in PYTHONPATH). This is probably because we use a fake HOME
with --user install option. Failure shows up when running tests through tox
without system site packages (see next patch).
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')