[FIX] *: python 3.8 compatibility

time.clock is deprecated since python 3.3 and no longer exists in python 3.8
time.process_time was introduced in python 3.3

Replace "is" by "==" as this produces a SyntaxWarning in python 3.8

Fixes odoo/odoo#41313

closes odoo/odoo#44332

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>