services: fix timer draining

[AnnaShaleva]

Ref. #3736.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 82.83%. Comparing base (35c2c5c) to head (827acfc).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/services/rpcsrv/server.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3737      +/-   ##
==========================================
- Coverage   82.85%   82.83%   -0.02%     
==========================================
  Files         335      335              
  Lines       46848    46850       +2     
==========================================
- Hits        38814    38807       -7     
- Misses       6443     6451       +8     
- Partials     1591     1592       +1     

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