airframe-rpc: Add a new integration test with the new Http RPC client

[xerial]

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[codecov]

Codecov Report

Merging #2232 (f4bc78a) into master (439fb5b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2232   +/-   ##
=======================================
  Coverage   82.61%   82.61%           
=======================================
  Files         314      314           
  Lines       12428    12428           
  Branches      771      771           
=======================================
  Hits        10268    10268           
  Misses       2160     2160           

Impacted Files	Coverage Δ
...wvlet/airframe/http/router/HttpRequestMapper.scala	95.18% <ø> (ø)

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