Merge PR #30217 into master

* refs/pull/30217/head:
	crimson: common/admin_socket kludge so that it builds
	mon/MonClient: fix sending mon command to a specific rank
	src/.gitignore: ignore .tox
	mon/MonClient: interpret numeric mon target name as rank
	mgr,mgr/MgrClient: use fsid to signal mon-mgr vs cli MCommands
	qa/workunits/cephtool: fix errpr checks for 'ceph daemon' commands
	common/ceph_context: make 'config unset' idempotent
	qa/tasks/dump_stuck: mon.a, not mon.0
	qa/suites/rados/singleton/all/admin-socket: fix test
	common/config: EPERM setting config option after startup
	qa/workunits/cephtool/test.sh: fix tell output error check
	common/admin_socket: pass Formatter from generic infrastructure
	common/admin_socket: pass ostream to call() for error output
	os/bluestore: fix asok hook return value
	rgw: fix asok return value
	common/ceph_context: return error code from asok commands
	test/pybind/test_rados: fix accidental mon tell test
	mon: print entity_name along with caps to debug log
	PendingReleaseNotes: notes about asok changes
	mgr/MgrClient: empty target string for 'tell' means active mgr
	common/admin_socket: report error code as part of output string
	osd: change trigger_[deep_]scrub tommands to a pg tell command
	osd: remove old command workqueue, threadpool
	osd: drop MMonCommand handling
	osdc/Objecter: resend OSD tell commands on EAGAIN
	osd: route tell commands to asok; migrate commands
	osd: use unique_ptr<Formatter> for asok_command
	common/ceph_context: add generic asok 'injectargs'
	common/admin_socket: allow dup prefixes
	common/admin_socket: refactor with sync and async execute_command variants
	common/admin_socket: pass input bufferlist
	osd: transition to call_async() for asok
	common/admin_socket: support alternative call_async()
	mon/MonClient: send tell commands out of band via MCommand
	mon: accept tell commands via MCommand and send them to asok handler
	common/admin_socket: return int from hook call()
	mgr/DaemonServer: route MCommand (for octopus+) to asok commands
	do not use 'ceph tell mgr'
	pybind/ceph_argparse: disambiguate mgr tell and CLI commands
	ceph: make 'ceph tell mgr.*' send to the active mgr
	ceph: send 'ceph tell mgr.X' to the right mgr
	librados: add rados_mgr_command_target
	mgr/MgrClient: add start_command variant that takes a target
	common/admin_socket: drop unregister_command(); use per-hook variant
	common/admin_socket: drop explicit prefix arg to register_command
	common/admin_socket: simplify command routing
	common/admin_socket: add ability to process MCommand via asok queue
	common/admin_socket: pass cmdvec to execute_command
	common/admin_socket: use pipe for general wakeup
	include/compat: add flags arg to pipe_cloexec
	common/admin_socket: drop unused args

Reviewed-by: Neha Ojha <nojha@redhat.com>

diff --cc PendingReleaseNotes
Simple merge

diff --cc qa/workunits/cephtool/test.sh
Simple merge

diff --cc src/client/Client.cc
Simple merge

diff --cc src/include/rados/librados.h
Simple merge

diff --cc src/librados/librados_c.cc
Simple merge

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

diff --cc src/mgr/DaemonServer.cc
Simple merge

diff --cc src/os/filestore/FileStore.cc
Simple merge

diff --cc src/osd/OSD.cc
Simple merge

diff --cc src/osd/OSD.h
Simple merge

diff --cc src/osd/PG.h
Simple merge

diff --cc src/osd/PrimaryLogPG.cc
Simple merge

diff --cc src/osd/PrimaryLogPG.h
Simple merge

diff --cc src/osdc/Objecter.cc
Simple merge