Remove gorilla/context from vendor.conf

[justincormack]

This has been unused since we switched to Go context. It is only
a dependency of gorilla/mux if built on pre 1.7 Go.

Signed-off-by: Justin Cormack [email protected]

[codecov]

Codecov Report

Merging #2556 into master will decrease coverage by 9.66%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #2556      +/-   ##
=========================================
- Coverage   60.87%   51.2%   -9.67%     
=========================================
  Files         129     129              
  Lines       11876   11876              
=========================================
- Hits         7229    6081    -1148     
- Misses       3744    5032    +1288     
+ Partials      903     763     -140

Impacted Files	Coverage Δ
registry/storage/driver/gcs/gcs.go	0.39% <0%> (-68.67%)	⬇️
registry/storage/driver/oss/oss.go	0.56% <0%> (-56.91%)	⬇️
registry/storage/driver/s3-goamz/s3.go	0.5% <0%> (-51.14%)	⬇️
registry/storage/driver/s3-aws/s3.go	4.15% <0%> (-50.98%)	⬇️
registry/client/transport/transport.go	69.69% <0%> (-9.1%)	⬇️

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[dmcgowan]

LGTM