Added Keywords to Fetch replicasets in a namespace

\<Remember to add meaningful title>

\<Short description of the PR>

Fixes #\<issue number>

Before merge following needs to be applied:

[ ] At least one example testcase added in testcases/
[ ] Library Documentation regenerated according to Generate docs
[ ] PR entry added in CHANGELOG.md in In progress section
[ ] All new testcases tagged as prerelease along other tags to exclude it from execution until released on PyPI
[ ] Coverage threshold increased in .coveragerc if new coverage is higher than actual, see the lint-and-coverage step in CI
```
fail_under = 67
```

devopsspiral / KubeLibrary