Merge PR #25879 into master

Merge PR #25879 into master

* refs/pull/25879/head:
	client: define template to declare ref
	client: use message smart ptr instead of raw ptr
	client: make map lookup optimizations
	client: do not clear message payload
	client: clean up variable name
	*: use std::string_view instead of char ptr

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