[FIX] test_rpc: use relative import (P3 compat)
[FIX] test_rpc: use relative import (P3 compat)

Oversight of previous forward-port.

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