Merge PR #28727 into master

* refs/pull/28727/head:
	test/crimson: resolve name collision
	test: switch to ldout; let users specify mon debug level
	test: add new ElectionLogic unit test framework
	elector: const-ify a bunch of functions
	elector: swap order of parameters in ElectionLogic::receive_propose
	elector: Update Elector and ElectionLogic function documentation
	elector: persist the epoch in bump_epoch()
	elector: make some more ElectionLogic members private
	elector: fix privacy and restore dout in Elector
	elector: don't clear peer_info in bump_epoch()
	elector: split ElectionLogic into its own compilation unit
	elector: move all the elector callouts into the Elector
	elector: make ElectionLogic private to Elector; undo most public shenanigans
	elector: create declare_standlone_victory in Elector/Logic for Monitor
	elector: make ElectionLogic::declare_victory private
	elector: route _bump_epoch through the interface-to-be
	elector: rename handle_propose_logic -> receive_propose
	elector: hoist handle_victory into ElectionLogic
	elector: hoist handle_ack into ElectionLogic
	elector: hoist victory into ElectionLogic
	elector: hoist expire into ElectionLogic
	elector: hoist start into ElectionLogic
	elector: hoist participating into ElectionLogic
	elector: hoist init into ElectionLogic
	elector: hoist defer into ElectionLogic
	elector: split handle_propose in two and hoist into ElectionLogic
	elector: hoist bump_epoch into ElectionLogic
	elector: store accessors for ElectionLogic
	elector: hoist Elector data bits out into a new ElectionLogic class
	mon: Rearrange Paxos::dispatch to be a little cleaner

Reviewed-by: Brad Hubbard <bhubbard@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>