Merge PR #24688 into master

* refs/pull/24688/head:
	common: make ceph_abort store same crash info as ceph_assert
	global: store assert msg in global and dump to crash meta
	pybind/mgr: make 'ceph crash ls' output sorted list
	log: don't clear ring when dump_recent is called
	ceph-crash: make clear to user that 'posted' should be directory

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