The following pathces made over the multipath-tools tree today
fix some bugs in the rbd checker and sync up log messages.
The first 4 patches are a resend from here:
https://www.redhat.com/archives/dm-devel/2016-August/ msg00429.html
I did not see any review comments (of course let me know if I missed
them), so the only changes are from being rebased on the current tree.
The last patch is new and adds a fix for when rbd's lock_on_read
feature is used.