[devtools] remove the remaining bw compat for old-style tests It is just: * dangerously untested right now * on the path of further bw compat removal (cnxset handling) webtest drops an apparently pointless .login call Related to #3933480.

version=3
opts=uversionmangle=s/(rc|a|b|c)/~$1/ \
http://pypi.debian.net/cubicweb/cubicweb-(.+)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))