tiup bench tpch run queries in a strange order

[fuzhe1989]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

Run tpch using tiup bench tpch --sf=1 run

2. What did you expect to see?

Queries run sequentially as their seq num (q1, q2, q3, q4 ...).

3. What did you see instead?

4. What version of TiUP are you using (tiup --version)?

1.4.0 tiup
Go Version: go1.16.2
Git Ref: v1.4.0
GitHash: eb335e6ad9d0dc19d1c43db422cd409d62bc3cea

[AstroProfundis]

@lucklove PTAL