[IMP] module loading and tests profiling

Add a loglevel 25 to log some INFO to runbot
Add timers for loading and testing
Silence empty test suite
ir_logging use relative pathname, warning this doesnt work for --addons-path modules yet.
[IMP] test impprove HTTPCase opener

Simplify website crawler using the generic HTTPCase opener
 Merge branch 'master' of https://github.com/odoo/odoo into master-linux64