reduce verbosity of p2p tests and use ipv6 stack

Context

This MR reduce the verbosity of the p2p tests. Now the majority of messages are at the debug level instead of info. This will be useful while moving the tests to alcotezt.

Also, for quite some times, instead of using the ipv6 stack, because of a limitation of the ci runners, we were using the ipv4 stack instead. This limitation has now being lifted, so this MR uses the address ::1 ( ipv6 localhost ) to run all tests.

This is a spinoff from !7997 (merged) and !8184 (merged)

Manually testing the MR

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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