Backport of client: fix IPv6 parsing for client.servers
block into release/1.5.x
#20325
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Backport
This PR is auto-generated from #20324 to be assessed for backporting due to the inclusion of the label backport/1.5.x.
The below text is copied from the body of the original PR.
When the
client.servers
block is parsed, we split the port from the address. This does not correctly handle IPv6 addresses when they are in URL format (wrapped in brackets), which we require to disambiguate the port and address.Fix the parser to correctly split out the port and handle a missing port value for IPv6. Update the documentation to make the URL format requirement clear.
Fixes: #20310
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