Why is this PR required? What issue does it fix?:
Fixes #373

What this PR does?:
The PR allows for IPv6 address discovery for the replica address.
IPv4 is still preferred if available

Does this PR require any upgrade changes?:

If the changes in this PR are manually verified, list down the scenarios covered::

Any additional information for your reviewer? :
Mention if this PR is part of any design or a continuation of previous PRs

Checklist:

• PR Title follows the convention of <type>(<scope>): <subject>.
• Has the change log section been updated?
• Commit has unit tests
• Commit has integration tests
• (Optional) Does this PR change require updating Helm Chart? If yes, mention the Helm Chart PR #
• (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• (Optional) If documentation changes are required, which issue https://github.com/openebs/website is used to track them: