[devtools] CubicWebTC._check_html may have to deal with unicode or bytes
If called with template=None, CubicWebTC.view will not go through
main-template, and return the unicode data from the view directly
instead of encoded data.
if versions_map['cubicweb'][0] == (3, 7, 4):
config['http-session-time'] *= 60
config['cleanup-session-time'] *= 60
config['cleanup-anonymous-session-time'] *= 60