Test PI server server_id operation

[jwillemsen]

* tests/pi/forward_request/run_test.pl:
* tests/pi/forward_request/server_request_interceptor.cpp:

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (b75d3e6) 59.77% compared to head (9c92cba) 59.66%.
Report is 6 commits behind head on master.

Files	Patch %	Lines
.../pi/forward_request/server_request_interceptor.cpp	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #358      +/-   ##
==========================================
- Coverage   59.77%   59.66%   -0.11%     
==========================================
  Files         589      589              
  Lines       47997    47510     -487     
  Branches     4233     4210      -23     
==========================================
- Hits        28689    28348     -341     
+ Misses      16187    16049     -138     
+ Partials     3121     3113       -8     

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