ci: use go1.12 on CircleCI

And update go.sum from a go1.12 mod tidy.

.circleci/config.yml

@@ -39,7 +39,7 @@ jobs:
           path: ~/project
   e2e:
     docker:
-      - image: circleci/golang:1.11-node-browsers
+      - image: circleci/golang:1.12-node-browsers
     environment:
       GOCACHE: /tmp/go-cache
       GOFLAGS: '-mod=readonly -p=4' # Go on Circle thinks 32 CPUs are available, but there aren't.
@@ -74,7 +74,7 @@ jobs:
           destination: screenshots
   jstest:
     docker:
-      - image: circleci/golang:1.11-node-browsers
+      - image: circleci/golang:1.12-node-browsers
     working_directory: /go/src/github.com/influxdata/influxdb
     steps:
       - checkout
@@ -84,7 +84,7 @@ jobs:
 
   gotest:
     docker:
-      - image: circleci/golang:1.11
+      - image: circleci/golang:1.12
     environment:
       GOCACHE: /tmp/go-cache
       GOFLAGS: '-mod=readonly -p=2' # Go on Circle thinks 32 CPUs are available, but there aren't.
@@ -115,11 +115,6 @@ jobs:
       - run: GO111MODULE=on go mod vendor # staticcheck looks in vendor for dependencies.
       - run: GO111MODULE=on go install honnef.co/go/tools/cmd/staticcheck # Install staticcheck from the version we specify in go.mod.
       - run: staticcheck ./...
-      # In go1.11, running go mod vendor when go.mod contains replace entries, "taints" go.sum, even with -mod=readonly.
-      # See https://github.com/golang/go/issues/27868.
-      # Clean up go.sum so that we save to the same module key we attempted to restore from.
-      # TODO: remove this call to git checkout after we are on go1.12.
-      - run: git checkout -- go.sum
 
       - save_cache:
           name: Saving GOCACHE
@@ -136,7 +131,7 @@ jobs:
 
   build:
     docker:
-      - image: circleci/golang:1.11-node-browsers
+      - image: circleci/golang:1.12-node-browsers
     environment:
       GOCACHE: /tmp/go-cache
       GOFLAGS: '-mod=readonly -p=4' # Go on Circle thinks 32 CPUs are available, but there aren't.
@@ -167,7 +162,7 @@ jobs:
 
   deploy-nightly:
     docker:
-      - image: circleci/golang:1.11-node-browsers
+      - image: circleci/golang:1.12-node-browsers
     environment:
       GOCACHE: /tmp/go-cache
       GOFLAGS: '-mod=readonly -p=4' # Go on Circle thinks 32 CPUs are available, but there aren't.
@@ -199,7 +194,7 @@ jobs:
 
   release:
     docker:
-      - image: circleci/golang:1.11-node-browsers
+      - image: circleci/golang:1.12-node-browsers
     environment:
       GOCACHE: /tmp/go-cache
       GOFLAGS: '-mod=readonly -p=4' # Go on Circle thinks 32 CPUs are available, but there aren't.

go.sum

@@ -227,6 +227,7 @@ github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NH
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/influxdata/flux v0.25.0 h1:ZYegi5UMI6jUnXg5MqH+j4OvIvMMlHMc+PVd2pdQd2E=
 github.com/influxdata/flux v0.25.0/go.mod h1:0f5Yrm4VPSd/Ne6jIVOVtPo0MFe6jpLCr6vdaZYp7wY=
+github.com/influxdata/goreleaser v0.97.0-influx h1:jT5OrcW7WfS0e2QxfwmTBjhLvpIC9CDLRhNgZJyhj8s=
 github.com/influxdata/goreleaser v0.97.0-influx/go.mod h1:MnjA0e0Uq6ISqjG1WxxMAl+3VS1QYjILSWVnMYDxasE=
 github.com/influxdata/influxql v0.0.0-20180925231337-1cbfca8e56b6 h1:CFx+pP90q/qg3spoiZjf8donE4WpAdjeJfPOcoNqkWo=
 github.com/influxdata/influxql v0.0.0-20180925231337-1cbfca8e56b6/go.mod h1:KpVI7okXjK6PRi3Z5B+mtKZli+R1DnZgb3N+tzevNgo=