Support hostname with _ in name

[Piotr Wielgołaski]

Bug Report

I spotted the same issue that was described here https://www.chrissearle.org/2022/02/22/r2dbc-postgresql-invalid-ipv6-address-when-dockerized/
When using docker host alias with _ host and port are incorrectly parsed.

Versions

• Driver: 1.0.0
• Database: not relevant
• Java: 11
• OS: macOS

Current Behavior

Host is incorrect parsed. Host contains port instead keeping port in port variable.

Stack trace

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Table schema

Input Code

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Steps to reproduce

Input Code

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Expected behavior/code

Possible Solution

Additional context

[Piotr Wielgołaski]

It looks that this is underlying issue https://stackoverflow.com/questions/28568188/java-net-uri-get-host-with-underscores