Update to Go 1.10 for travis and build to get t.Helper

Author: smarterclayton

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - 1.8
+  - "1.10"
 
 before_install:
   - go get github.com/alecthomas/gometalinter

hack/lib/constants.sh

@@ -4,7 +4,7 @@
 
 readonly OS_GO_PACKAGE=github.com/openshift/image-registry
 
-readonly OS_BUILD_ENV_GOLANG="${OS_BUILD_ENV_GOLANG:-1.8}"
+readonly OS_BUILD_ENV_GOLANG="${OS_BUILD_ENV_GOLANG:-1.10}"
 readonly OS_BUILD_ENV_IMAGE="${OS_BUILD_ENV_IMAGE:-openshift/origin-release:golang-${OS_BUILD_ENV_GOLANG}}"
 readonly OS_REQUIRED_GO_VERSION="go1.8"
 readonly OS_BUILD_ENV_WORKINGDIR="/go/src/${OS_GO_PACKAGE}"