Fix also IPv6 addresses for --nodns etc....

[drwetter]

Seems the patch in #2856 wasn't complete. So that it was forgotten to add also manually specified IPv6 addresses to the IP addresses to show and to scan. This makes sure it does, so this fixes #2854 finally.

Also statements were added to reset do_ipv4_only and do_ipv6_only correctly so that later the output "Testing all IP** addresses" is correct.

What is your pull request about?

• Bug fix
• Improvement
• New feature (adds functionality)
• Breaking change (bug fix, feature or improvement that would cause existing functionality to not work as expected)
• Typo fix
• Documentation update
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If it's a code change please check the boxes which are applicable

• For the main program: My edits contain no tabs, indentation is five spaces and any line endings do not contain any blank chars
• I've read CONTRIBUTING.md and Coding_Convention.md
• I have tested this fix or improvement against >=2 hosts and I couldn't spot a problem
• I have tested this new feature against >=2 hosts which show this feature and >=2 host which does not (in order to avoid side effects) . I couldn't spot a problem
• For the new feature I have made corresponding changes to the documentation and / or to help()
• If it's a bigger change: I added myself to CREDITS.md (alphabetical order) and the change to CHANGELOG.md