[FIX] core: remove import of deprecated `imp` module
[FIX] core: remove import of deprecated `imp` module

Was already not used, it's just that the import was not
removed. Remove a bunch of other unused imports while at it.
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo