rcuscale: Add tests for simple hazard pointers

Add two rcu_scale_ops to include tests from simple hazard pointers
(shazptr). One is with evenly distributed readers, and the other is with
all WILDCARD readers. This could show the best and worst case scenarios
for the synchronization time of simple hazard pointers.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>