fix: allow IPv6 addresses for --ip and --server args

[xvzf]

partially fixes #398 (though with auto-discovery and without flags). This still requires a dual-stack setup on the nodes until Github is finally reachable on the modern internet ;-)

Signed-off-by: Matthias Riegler [email protected]

Why do you need this?

Bootstrapping dual-stack clusters with IPv6 node addresses

How Has This Been Tested?

Bringing ip a dual-stack cluster and setting --ip=... to an IPv6 address

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• x ] I've read the CONTRIBUTION guide
• [x] I have signed-off my commits with git commit -s
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.