CI: Enable go linter in GH Actions about csi-driver-nfs HOT 2 CLOSED

# hack/verify-all.sh
Verifying gofmt
No issue found
Verifying govet
go: downloading k8s.io/api v0.18.0
go: downloading k8s.io/kubernetes v1.18.0
go: downloading k8s.io/client-go v0.18.0
go: downloading k8s.io/component-base v0.18.0
go: downloading k8s.io/apiserver v0.18.0
go: downloading k8s.io/cloud-provider v0.18.0
go: downloading k8s.io/kubectl v0.18.0
go: downloading github.com/prometheus/client_golang v1.5.1
go: downloading k8s.io/cri-api v0.18.11-rc.0
go: downloading k8s.io/kube-scheduler v0.18.0
go: downloading k8s.io/csi-translation-lib v0.18.0
Done
Verifying golint
pkg/nfs/controllerserver.go:90:6: `validCapacity` is unused (deadcode)
func validCapacity(requested int64, volumePath string) error {
     ^
test/e2e/testsuites/testsuites.go:54:2: `pollLongTimeout` is unused (deadcode)
        pollLongTimeout            = 5 * time.Minute
        ^
test/e2e/e2e_suite_test.go:23:2: `reportDirEnv` is unused (deadcode)
        reportDirEnv     = "ARTIFACTS"
        ^
test/e2e/e2e_suite_test.go:24:2: `defaultReportDir` is unused (deadcode)
        defaultReportDir = "test/e2e"
        ^
pkg/nfs/server.go:94:14: Error return value of `server.Serve` is not checked (errcheck)
        server.Serve(listener)
                    ^
cmd/nfsplugin/main.go:37:10: Error return value of `flag.Set` is not checked (errcheck)
        flag.Set("logtostderr", "true")
                ^
cmd/nfsplugin/main.go:42:24: Error return value of `flag.CommandLine.Parse` is not checked (errcheck)
        flag.CommandLine.Parse([]string{})
                              ^
cmd/nfsplugin/main.go:55:32: Error return value of `cmd.MarkPersistentFlagRequired` is not checked (errcheck)
        cmd.MarkPersistentFlagRequired("nodeid")
                                      ^
cmd/nfsplugin/main.go:58:32: Error return value of `cmd.MarkPersistentFlagRequired` is not checked (errcheck)
        cmd.MarkPersistentFlagRequired("endpoint")
                                      ^
cmd/nfsplugin/main.go:62:16: Error return value of `cmd.ParseFlags` is not checked (errcheck)
        cmd.ParseFlags(os.Args[1:])
                      ^
pkg/nfs/controllerserver.go:108:2: var `volumeId` should be `volumeID` (golint)
        volumeId := req.GetVolumeId()
        ^
pkg/nfs/controllerserver.go:345:29: method getVolumeIdFromNfsVol should be getVolumeIDFromNfsVol (golint)
func (cs *ControllerServer) getVolumeIdFromNfsVol(vol *nfsVolume) string {
                            ^
pkg/nfs/controllerserver.go:354:29: method getNfsVolFromId should be getNfsVolFromID (golint)
func (cs *ControllerServer) getNfsVolFromId(id string) (*nfsVolume, error) {
                            ^
pkg/nfs/controllerserver_test.go:19:2: const `testVolumeId` should be `testVolumeID` (golint)
        testVolumeId  = "test-server/test-base-dir/test-csi"
        ^
pkg/nfs/nfs.go:55:58: exported func NewNFSdriver returns unexported type *github.com/kubernetes-csi/csi-driver-nfs/pkg/nfs.nfsDriver, which can be annoying to use (golint)
func NewNFSdriver(nodeID, endpoint string, perm *uint32) *nfsDriver {
                                                         ^
pkg/nfs/nfs.go:85:59: exported func NewNodeServer returns unexported type *github.com/kubernetes-csi/csi-driver-nfs/pkg/nfs.nodeServer, which can be annoying to use (golint)
func NewNodeServer(n *nfsDriver, mounter mount.Interface) *nodeServer {
                                                          ^
pkg/nfs/nodeserver.go:110:10: `if` block ends with a `return` statement, so drop this `else` and outdent its block (golint)
                } else {
                       ^
pkg/nfs/nfs.go:124:2: S1023: redundant `return` statement (gosimple)
        return
        ^
pkg/nfs/server.go:42:2: S1023: redundant `return` statement (gosimple)
        return
        ^
pkg/nfs/controllerserver_test.go:39:3: SA1006: printf-style function with dynamic format string and no further arguments should use print-style function instead (staticcheck)
                fmt.Printf(err.Error())
                ^
pkg/nfs/nodeserver.go:166:6: func `getVolumeMetrics` is unused (unused)