[dbapi] Fix broken inmemory:// URLs parsing (closes #3225832) ParseResult.path is what comes after the "domain name" in standard URLs. So in the case of 'inmemory://<instance' URLs, it is always empty. ParseResult.netloc contains the "domain name" part that we really want.

version=3
http://download.logilab.org/pub/cubicweb cubicweb-(.*)\.tar\.gz