ceph_test_rados_api_tier: make HitSetRead test less noisy

Signed-off-by: Sage Weil <sage@inktank.com>
osd/HitSet: fix sealed initialization in Params ctor

Signed-off-by: Sage Weil <sage@inktank.com>
fix trim version
ceph_test_rados_api_tier: add HitSet trim test

Signed-off-by: Sage Weil <sage@inktank.com>