[UT]Checkpoint,simpleTest

[Shylock-Hg]

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Describe the bug (must be provided)

https://github.com/vesoft-inc/nebula/pull/1874/checks?check_run_id=489223668

The leader not elected completely when start write.

Your Environments (must be provided)

• OS: uname -a
• Compliler: g++ --version or clang++ --version
• CPU: lscpu
• Commit id (e.g. a3ffc7d8)

How To Reproduce(must be provided)

Steps to reproduce the behavior:

1. Step 1
2. Step 2
3. Step 3

Expected behavior

A clear and concise description of what you expected to happen.

Additional context

#1306