Merge pull request #40921 from kamoltat/wip-pool-start-out-with-1-pg

mon/OSDMonitor: prepare_new_pool() starts out with 1 pg

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

diff --cc src/common/options/global.yaml.in
Simple merge

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