Merge pull request #42900 from ajarr/wip-51834-pacific

pacific: mds: create file system with specific ID

Reviewed-by: Ramana Raja <rraja@redhat.com>

diff --cc PendingReleaseNotes
Simple merge

diff --cc doc/cephfs/administration.rst
Simple merge

diff --cc qa/tasks/cephfs/test_admin.py
Simple merge

diff --cc src/mds/FSMap.cc
Simple merge

diff --cc src/mds/FSMap.h
Simple merge

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

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