transaction: Handle "commit ts expired" error

[pingyu]

As title.

[iosmanthus]

Where are this enum value referenced?

[pingyu]

In following block in src/store/error.rs:

impl<T: HasKeyErrors> HasKeyErrors for Result<T, Error> {
    fn key_errors(&mut self) -> Option<Vec<Error>> {
        match self {
            Ok(x) => x.key_errors(),
            Err(Error::MultipleKeyErrors(errs)) => Some(std::mem::take(errs)),
            Err(e) => Some(vec![std::mem::take(e)]),
        }
    }
}

The std::mem::take requires Default.

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