Merge pull request #12472 from dillaman/wip-18244

librbd: remove image header lock assertions

Reviewed-by: Mykola Golub <mgolub@mirantis.com>

diff --cc src/test/librbd/object_map/test_mock_ResizeRequest.cc
Simple merge

diff --cc src/test/librbd/object_map/test_mock_SnapshotRemoveRequest.cc
Simple merge

diff --cc src/test/librbd/object_map/test_mock_SnapshotRollbackRequest.cc
Simple merge

diff --cc src/test/librbd/object_map/test_mock_UpdateRequest.cc
Simple merge