[FIX] hr_timesheet: extract common class tests
[FIX] hr_timesheet: extract common class tests

Others test classes extends the setup method, and break the
tests enviroment configuration. Extracting the global setup
in a common class is more modular and will make the enterprise
tests green again !

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo