context, registry/handlers: remove net/context references

[stevvooe]

Signed-off-by: Stephen J Day [email protected]

[codecov]

Codecov Report

Merging #2500 into master will decrease coverage by 9.9%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2500      +/-   ##
==========================================
- Coverage   61.51%   51.61%   -9.91%     
==========================================
  Files         127      128       +1     
  Lines       11374    11727     +353     
==========================================
- Hits         6997     6053     -944     
- Misses       3508     4916    +1408     
+ Partials      869      758     -111

Impacted Files	Coverage Δ
registry/handlers/context.go	80.76% <ø> (ø)	⬆️
registry/storage/driver/gcs/gcs.go	0.4% <0%> (-68.94%)	⬇️
registry/storage/driver/s3-aws/s3.go	4.57% <0%> (-56.23%)	⬇️
registry/storage/driver/s3-goamz/s3.go	0.5% <0%> (-51.4%)	⬇️
registry/client/transport/transport.go	69.69% <0%> (-9.1%)	⬇️
registry/storage/driver/oss/oss.go	0.56% <0%> (ø)

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[dmcgowan]

LGTM