Log deprecation warning only when deprecated flags are set

[pavolloffay]

Signed-off-by: Pavol Loffay ploffay@redhat.com

[codecov]

Codecov Report

Merging #2479 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2479      +/-   ##
==========================================
+ Coverage   95.50%   95.53%   +0.02%     
==========================================
  Files         208      208              
  Lines       10756    10759       +3     
==========================================
+ Hits        10273    10279       +6     
+ Misses        407      405       -2     
+ Partials       76       75       -1     

Impacted Files	Coverage Δ
cmd/query/app/flags.go	100.00% <100.00%> (ø)
plugin/storage/badger/spanstore/reader.go	96.49% <0.00%> (-0.30%)	⬇️
...lugin/sampling/strategystore/adaptive/processor.go	100.00% <0.00%> (+0.79%)	⬆️
cmd/query/app/server.go	90.69% <0.00%> (+1.55%)	⬆️

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