Merge pull request #7939 from yangdongsheng/remove_v1

mon: standardize Ceph removal commands

Reviewed-by: Josh Durgin <jdurgin@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>

diff --cc src/mon/MDSMonitor.cc
Simple merge

diff --cc src/mon/MonCommands.h
Simple merge

diff --cc src/mon/OSDMonitor.cc
Simple merge