improve(algorithm): random walk vertex inactive

[diaohancai]

Purpose of the PR

• improve random walk algorithm

Main Changes

Verifying these changes

• [X] Trivial rework / code cleanup without any test coverage. (No Need)
• [ ] Already covered by existing tests, such as (please modify tests here).
• [ ] Need tests and can be verified as follows.

Does this PR potentially affect the following parts?

• [X] Nope
• [ ] Dependencies (add/update license info)
• [ ] Modify configurations
• [ ] The public API
• [ ] Other affects (typed here)

Documentation Status

• [ ] Doc - TODO
• [ ] Doc - Done
• [X] Doc - No Need

[codecov[bot]]

Codecov Report

Attention: 34 lines in your changes are missing coverage. Please review.

Comparison is base (e0b484a) 85.03% compared to head (a793509) 85.17%. Report is 6 commits behind head on master.

:exclamation: Current head a793509 differs from pull request most recent head c968235. Consider uploading reports for the commit c968235 to get more accurate results

Files	Patch %	Lines
...apache/hugegraph/computer/core/bsp/EtcdClient.java	52.38%	6 Missing and 4 partials :warning:
.../hugegraph/computer/core/worker/WorkerService.java	85.93%	8 Missing and 1 partial :warning:
.../hugegraph/computer/core/master/MasterService.java	50.00%	4 Missing and 3 partials :warning:
...hugegraph/computer/core/util/StringEncodeUtil.java	54.54%	5 Missing :warning:
...raph/computer/k8s/operator/OperatorEntrypoint.java	81.81%	2 Missing :warning:
...h/computer/core/network/session/ClientSession.java	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #301 +/- ## ============================================ + Coverage 85.03% 85.17% +0.14% - Complexity 3296 3300 +4 ============================================ Files 349 349 Lines 12485 12461 -24 Branches 1130 1123 -7 ============================================ - Hits 10616 10614 -2 + Misses 1329 1307 -22 Partials 540 540 ```

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[javeme]

Note the CI failed