[ISSUE #8259] fix parse ipv6 from address in haproxy

[yuz10]

Which Issue(s) This PR Fixes

Fixes #8259

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 42.93%. Comparing base (7558850) to head (10e7cc4). Report is 276 commits behind head on develop.

Files with missing lines	Patch %	Lines
...g/protocol/http2proxy/HAProxyMessageForwarder.java	0.00%	2 Missing :warning:

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8260      +/-   ##
=============================================
- Coverage      42.95%   42.93%   -0.02%     
+ Complexity     10390    10386       -4     
=============================================
  Files           1271     1271              
  Lines          88785    88785              
  Branches       11410    11410              
=============================================
- Hits           38135    38122      -13     
- Misses         45955    45960       +5     
- Partials        4695     4703       +8     

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