smoke: add nydusd hot upgrade test case

[imeoer]

Relevant Issue (if applicable)

• smoke: add nydusd hot upgrade test case
• smoke: refactor nydusd methods for testing

Details

Please describe the details of PullRequest.

Types of changes

What types of changes does your PullRequest introduce? Put an x in all the boxes that apply:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation Update (if none of the other choices apply)

Checklist

Go over all the following points, and put an x in all the boxes that apply.

• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.42%. Comparing base (32b6ead) to head (717999e).

Additional details and impacted files

[](https://app.codecov.io/gh/dragonflyoss/nydus/pull/1603?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss) ```diff @@ Coverage Diff @@ ## master #1603 +/- ## ========================================== - Coverage 61.43% 61.42% -0.01% ========================================== Files 145 145 Lines 48032 48032 Branches 46007 46007 ========================================== - Hits 29510 29506 -4 - Misses 16963 16964 +1 - Partials 1559 1562 +3 ``` [see 3 files with indirect coverage changes](https://app.codecov.io/gh/dragonflyoss/nydus/pull/1603/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss)