Update common.sh

[mukulgargg]

Because of this line, it is causing only to add new lines in nifi.properties, which leads to duplicate property key error in nifi startup.

Summary

NIFI-00000

Tracking

Please complete the following tracking steps prior to pull request creation.

Issue Tracking

• Apache NiFi Jira issue created

Pull Request Tracking

• Pull Request title starts with Apache NiFi Jira issue number, such as NIFI-00000
• Pull Request commit message starts with Apache NiFi Jira issue number, as such NIFI-00000

Pull Request Formatting

• Pull Request based on current revision of the main branch
• Pull Request refers to a feature branch with one commit containing changes

Verification

Please indicate the verification steps performed prior to pull request creation.

Build

• Build completed using mvn clean install -P contrib-check
  • JDK 21

Licensing

• New dependencies are compatible with the Apache License 2.0 according to the License Policy
• New dependencies are documented in applicable LICENSE and NOTICE files

Documentation

• Documentation formatting appears as expected in rendered files

[exceptionfactory]

Thanks for proposing this improvement @mukulgargg. As noted in the pull request template, every change requires an associated Jira issue. If you can create a reference Jira issue and update the pull request title accordingly, this should be ready to review.

[exceptionfactory]

Closing for now, feel free to reopen after creating an issue the Apache NiFi Jira project summarizing the changes needed.