Merge PR #25623 into master

* refs/pull/25623/head:
	common/ceph_time: 'mo' for month
	common/options: use new parse_timespan
	common/ceph_time: add parse_timespan
	common/config_proxy: pass err_ss through on set_val
	common/ceph_time: add exact_timespan_str

Reviewed-by: Kefu Chai <kchai@redhat.com>

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

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