ditsing/ruaft @ 6ce8d929e8d43f454d49f5fddafa176000e5dc20

Jing Yang 8e36805176 Add snapshot functions to persister.		%!s(int64=5) %!d(string=hai) anos
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persister	8e36805176 Add snapshot functions to persister.	%!s(int64=5) %!d(string=hai) anos
mod.rs	2cf4d68306 Use generic types to allow different types of Command.	%!s(int64=5) %!d(string=hai) anos