Merge pull request #13196 from vshankar/rbd-ut-fix

test: fix rbd unit test cases w/ striping feature

Reviewed-by: Jason Dillaman <dillaman@redhat.com>

diff --cc src/librbd/io/ImageRequestWQ.h
Simple merge

diff --cc src/test/librbd/mock/MockImageCtx.h
Simple merge

diff --cc src/test/librbd/test_librbd.cc
Simple merge