patches/Restricted: allow random.Random

all member of random module are available (because in ZopeGuards, there's a
random.__allow_access_to_unprotected_subobjects__ = 1), SystemRandom class
also is, but Random class was not, even though there should be nothing unsafe
in this.

This is needed if we want to use a random number generator with a fixed seed
to get reproductible results. We could use random.seed module level function
but since this is also used by several things in ERP5 this does not produce
reproductible sequences.
5 jobs for feat/normalize_restricted_test in 0 seconds (queued for 1 second)
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

01:37:06

failed ERP5.PerformanceTest-Master

02:54:37

failed ERP5.UnitTest-Master

02:05:40

failed ERP5.UnitTest-Master.Medusa

02:38:46

passed SlapOS.Eggs.UnitTest-Master.Python2

00:30:33