AXIS2-6055: Basic Auth credentials are missing in request

[gtache]

Not sure if it's the best way to do it (cf : https://www.baeldung.com/httpclient-basic-authentication)
Also not sure how to test if this is working correctly.

[codecov-commenter]

Codecov Report

Merging #503 (b9b45a8) into master (dee7a85) will increase coverage by 0.00%.
Report is 2 commits behind head on master.
The diff coverage is 66.66%.

❗ Current head b9b45a8 differs from pull request most recent head 29e3eff. Consider uploading reports for the commit 29e3eff to get more accurate results

@@           Coverage Diff           @@
##           master     #503   +/-   ##
=======================================
  Coverage   37.25%   37.26%           
=======================================
  Files        1501     1501           
  Lines      115075   115081    +6     
  Branches    22595    22597    +2     
=======================================
+ Hits        42872    42881    +9     
+ Misses      65038    65035    -3     
  Partials     7165     7165           

Files	Coverage Δ
...2/transport/http/impl/httpclient4/RequestImpl.java	66.39% <66.66%> (+0.01%)	⬆️

... and 8 files with indirect coverage changes

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