Merge pull request #18317 from hitoshikamei/master-rbd

rbd: eager-thick provisioning support

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

diff --cc qa/workunits/rbd/cli_generic.sh
Simple merge

diff --cc src/common/options.cc
Simple merge

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

diff --cc src/test/cli/rbd/help.t
Simple merge

diff --cc src/tools/rbd/ArgumentTypes.h
Simple merge