ceph_test_rados_api_tier: fix osd pool set json syntax

String, not int.

Signed-off-by: Sage Weil <sage@inktank.com>
osd/ReplicatedPG: do not flush|evict degraded objects

The repop won't work right; we still repair the object before making
any update.

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