ditsing/ruaft @ d303c29a77e0aa527fcb693c7232f3e8061d3017

Jing Yang d303c29a77 Better shutdown for kv server.		%!s(int64=4) %!d(string=hai) anos
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src	d303c29a77 Better shutdown for kv server.	%!s(int64=4) %!d(string=hai) anos
tests	f93a1fa8f7 Add two lineariability tests.	%!s(int64=4) %!d(string=hai) anos
Cargo.toml	fc6fa38733 Remove scopeguard from dependencies.	%!s(int64=4) %!d(string=hai) anos