Prometheus http_sd discovery and unit test

[sjmshsh]

why 22222 int pkg/admin/util/monitor_utils.go? ans: After communicating with the relevant person in charge, he asked me to write 22222 to death first, and the follow-up monitoring port will be put into the registration center.

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[codecov-commenter]

Codecov Report

Merging #1070 (1217a0e) into refactor-with-go (8e28727) will increase coverage by 0.10%. The diff coverage is 78.57%.

@@                 Coverage Diff                  @@
##           refactor-with-go    #1070      +/-   ##
====================================================
+ Coverage             69.46%   69.56%   +0.10%     
====================================================
  Files                    30       31       +1     
  Lines                  2361     2389      +28     
====================================================
+ Hits                   1640     1662      +22     
- Misses                  604      608       +4     
- Partials                117      119       +2     

Impacted Files	Coverage Δ
pkg/admin/services/prometheus_service_impl.go	12.87% <73.91%> (+12.87%)	:arrow_up:
pkg/admin/util/monitor_utils.go	100.00% <100.00%> (ø)

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0 Bugs
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No Coverage information
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[AlbumenJ]

@chickenlj PTAL