Merge pull request #18397 from tchaikov/wip-mon-opts

common/options: set max_background_jobs instead of max_background_compactions

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

diff --cc src/common/legacy_config_opts.h
Simple merge

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

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