Upgrade to Go 1.9

[yurishkuro]

No description provided.

[coveralls]

Coverage remained the same at 100.0% when pulling 117d452 on go-1.8 into 489d7ed on master.

[coveralls]

Coverage remained the same at 100.0% when pulling efacab9 on go-1.8 into 489d7ed on master.

[coveralls]

Coverage remained the same at 100.0% when pulling 170ee04 on go-1.8 into 489d7ed on master.

[coveralls]

Coverage remained the same at 100.0% when pulling 4453bac on go-1.8 into 489d7ed on master.

[coveralls]

Coverage remained the same at 100.0% when pulling d0646ce on go-1.8 into 489d7ed on master.

[coveralls]

Coverage remained the same at 100.0% when pulling d0646ce on go-1.8 into 489d7ed on master.

[coveralls]

Coverage decreased (-0.05%) to 99.953% when pulling 4a4dec9 on go-1.8 into 0302c8d on master.

[vprithvi]

gotestcover is deprecated and recommends using the following

echo 'mode: atomic' > coverage.txt && go list ./... | xargs -n1 -I{} sh -c 'go test -covermode=atomic -coverprofile=coverage.tmp {} && tail -n +2 coverage.tmp >> coverage.txt' && rm coverage.tmp

See: https://github.com/pierrre/gotestcover#deprecated

[coveralls]

Coverage remained the same at 100.0% when pulling 7743ad5 on go-1.8 into 0302c8d on master.

[vprithvi]

The branch name should be updated to go-1.9