envoy EDS sample and instructions without unit test

[guanw]

No description provided.

[codecov]

Codecov Report

Merging #50 into master will decrease coverage by 15.96%.
The diff coverage is 2.85%.

@@             Coverage Diff             @@
##           master      #50       +/-   ##
===========================================
- Coverage   92.23%   76.27%   -15.97%     
===========================================
  Files          17       17               
  Lines         322      392       +70     
===========================================
+ Hits          297      299        +2     
- Misses         16       84       +68     
  Partials        9        9

Impacted Files	Coverage Δ
pkg/http/http_handler.go	35.13% <2.85%> (-55.11%)	⬇️

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