add chaining function Discovery to disable/enable discovery feature for package gclient; fix issue #2737

[gqcn]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.07 🎉

Comparison is base (740dfa5) 78.85% compared to head (300bfd5) 78.93%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2738      +/-   ##
==========================================
+ Coverage   78.85%   78.93%   +0.07%     
==========================================
  Files         633      631       -2     
  Lines       51970    51854     -116     
==========================================
- Hits        40980    40930      -50     
+ Misses       8961     8907      -54     
+ Partials     2029     2017      -12     

Flag	Coverage Δ
go-1.15-386	78.89% <100.00%> (+0.01%)	⬆️
go-1.15-amd64	78.89% <100.00%> (+0.01%)	⬆️
go-1.16-386	78.88% <100.00%> (+0.01%)	⬆️
go-1.16-amd64	78.86% <100.00%> (-0.02%)	⬇️
go-1.17-386	78.88% <100.00%> (+0.01%)	⬆️
go-1.17-amd64	78.87% <100.00%> (-0.01%)	⬇️
go-1.18-386	?
go-1.18-amd64	?
go-1.19-386	?
go-1.19-amd64	?
go-1.20-386	?
go-1.20-amd64	?

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Impacted Files	Coverage Δ
net/gclient/gclient_chain.go	100.00% <100.00%> (ø)

... and 11 files with indirect coverage changes

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