Update Golang to 1.10

[thaJeztah]

ping @stevvooe @dmcgowan

[stevvooe]

LGTM

[thaJeztah]

Tests keep failing on x509: certificate has expired or is not yet valid 😞

[thaJeztah]

Ah hm... looking at https://github.com/docker/distribution/blob/11406050aff4a727bd6d3f427d04eac914e22886/contrib/docker-integration/nginx/ssl/registry-ca%2Bca.pem

Certificate Information:
Common Name: QuickTLS
Organization: QuickTLS
Valid From: May 26, 2015
Valid To: May 10, 2018
Issuer: QuickTLS, QuickTLS
Serial Number: 32c74f5a82c0b28fed20ebcb93c47fb0

[dmcgowan]

Opened #2594 to fix tests

[codecov]

Codecov Report

Merging #2582 into master will decrease coverage by 9.6%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2582      +/-   ##
==========================================
- Coverage   60.87%   51.26%   -9.61%     
==========================================
  Files         129      129              
  Lines       11876    11876              
==========================================
- Hits         7229     6088    -1141     
- Misses       3744     5027    +1283     
+ Partials      903      761     -142

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%)	⬇️
...egistry/storage/cache/cachedblobdescriptorstore.go	56.25% <0%> (+10.41%)	⬆️
registry/storage/cache/cache.go	75% <0%> (+25%)	⬆️

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[dmcgowan]

LGTM