tests, net, OWNERS: Add nirdothan (#4423)

##### Short description:
Add nirdothan as network test reviewer.
##### More details:

##### What this PR does / why we need it:

##### Which issue(s) this PR fixes:

##### Special notes for reviewer:

##### jira-ticket:
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

## Release Notes

**No user-facing changes in this release.**

This update contains internal administrative changes only.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Nir Dothan <ndothan@redhat.com>

Author: nirdothan

tests/network/OWNERS

@@ -7,3 +7,4 @@ reviewers:
   - EdDev
   - servolkov
   - azhivovk
+  - nirdothan