feat: add go modules support and remove vendor

Author: weixiao-huang

go.mod

@@ -0,0 +1,71 @@
+module github.com/programming-kubernetes/pizza-apiserver
+
+go 1.13
+
+require (
+	cloud.google.com/go v0.1.1-0.20160913182117-3b1ae45394a2
+	github.com/Azure/go-autorest v11.1.0+incompatible
+	github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46
+	github.com/PuerkitoBio/purell v1.1.0
+	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578
+	github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973
+	github.com/coreos/etcd v3.3.10+incompatible
+	github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7
+	github.com/davecgh/go-spew v1.1.1
+	github.com/dgrijalva/jwt-go v3.0.1-0.20160705203006-01aeca54ebda+incompatible
+	github.com/emicklei/go-restful v1.1.4-0.20170410110728-ff4f55a20633
+	github.com/evanphx/json-patch v4.2.0+incompatible
+	github.com/go-openapi/jsonpointer v0.17.0
+	github.com/go-openapi/jsonreference v0.17.0
+	github.com/go-openapi/spec v0.17.2
+	github.com/go-openapi/swag v0.17.0
+	github.com/gogo/protobuf v1.1.1
+	github.com/golang/groupcache v0.0.0-20160516000752-02826c3e7903
+	github.com/golang/protobuf v1.2.0
+	github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf
+	github.com/googleapis/gnostic v0.0.0-20170729233727-0c5108395e2d
+	github.com/gophercloud/gophercloud v0.0.0-20190126172459-c818fa66e4c8
+	github.com/grpc-ecosystem/go-grpc-prometheus v0.0.0-20170330212424-2500245aa611
+	github.com/hashicorp/golang-lru v0.5.0
+	github.com/imdario/mergo v0.3.5
+	github.com/inconshreveable/mousetrap v1.0.0
+	github.com/json-iterator/go v0.0.0-20180701071628-ab8a2e0c74be
+	github.com/mailru/easyjson v0.0.0-20180823135443-60711f1a8329
+	github.com/matttproud/golang_protobuf_extensions v1.0.1
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd
+	github.com/modern-go/reflect2 v1.0.1
+	github.com/munnerz/goautoneg v0.0.0-20120707110453-a547fc61f48d
+	github.com/pborman/uuid v0.0.0-20150603214016-ca53cad383ca
+	github.com/prometheus/client_golang v0.9.2
+	github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910
+	github.com/prometheus/common v0.2.0
+	github.com/prometheus/procfs v0.0.0-20181204211112-1dc9a6cbc91a
+	github.com/spf13/cobra v0.0.4
+	github.com/spf13/pflag v1.0.3
+	golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9
+	golang.org/x/net v0.0.0-20190206173232-65e2d4e15006
+	golang.org/x/oauth2 v0.0.0-20170412232759-a6bd8cefa181
+	golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a
+	golang.org/x/text v0.3.0
+	golang.org/x/time v0.0.0-20161028155119-f51c12702a4d
+	golang.org/x/tools v0.0.0-20190206041539-40960b6deb8e
+	gonum.org/v1/gonum v0.0.0-20190413104459-5d695651a1d5
+	google.golang.org/appengine v1.5.0
+	google.golang.org/genproto v0.0.0-20170731182057-09f6ed296fc6
+	google.golang.org/grpc v1.13.0
+	gopkg.in/inf.v0 v0.9.0
+	gopkg.in/natefinch/lumberjack.v2 v2.0.0-20150622162204-20b71e5b60d7
+	gopkg.in/yaml.v2 v2.2.2
+	k8s.io/api v0.0.0-20190409021203-6e4e0e4f393b
+	k8s.io/apimachinery v0.0.0-20190404173353-6a84e37a896d
+	k8s.io/apiserver v0.0.0-20190409021813-1ec86e4da56c
+	k8s.io/client-go v11.0.1-0.20190409021438-1a26190bd76a+incompatible
+	k8s.io/code-generator v0.0.0-20190311093542-50b561225d70
+	k8s.io/component-base v0.0.0-20190409021516-bd2732e5c3f7
+	k8s.io/gengo v0.0.0-20181106084056-51747d6e00da
+	k8s.io/klog v0.2.1-0.20190306015804-8e90cee79f82
+	k8s.io/kube-openapi v0.0.0-20190228160746-b3a7cee44a30
+	k8s.io/utils v0.0.0-20190221042446-c2654d5206da
+	sigs.k8s.io/structured-merge-diff v0.0.0-20190302045857-e85c7b244fd2
+	sigs.k8s.io/yaml v1.1.0
+)