caaspctl: Move to go module for dependency resolving

go module is mature enough to replace dep.
This PR replaces go dep with go module and also
provide vendor directory from go module which is
far smaller than go dep.

OBS build will fail with go module enabled. So
disable go mod in OBS using `export GOMOD=off`
in build section of spec file.

Signed-off-by: Nirmoy Das <ndas@suse.de>

Makefile

@@ -1,4 +1,5 @@
-GO ?= go
+GOMOD ?= on
+GO ?= GO111MODULE=$(GOMOD) go
 GOFMT ?= gofmt
 TERRAFORM ?= $(shell which terraform 2>/dev/null || which true 2>/dev/null)
 GO_MD2MAN ?= go-md2man

go.mod

@@ -0,0 +1,74 @@
+module github.com/SUSE/caaspctl
+
+require (
+	github.com/MakeNowJust/heredoc v0.0.0-20171113091838-e9091a26100e // indirect
+	github.com/PuerkitoBio/purell v1.1.1 // indirect
+	github.com/Sirupsen/logrus v1.0.6 // indirect
+	github.com/chai2010/gettext-go v0.0.0-20170215093142-bf70f2a70fb1 // indirect
+	github.com/docker/distribution v2.7.1+incompatible // indirect
+	github.com/docker/docker v1.13.1 // indirect
+	github.com/docker/spdystream v0.0.0-20181023171402-6480d4af844c // indirect
+	github.com/emicklei/go-restful v2.9.3+incompatible // indirect
+	github.com/evanphx/json-patch v3.0.0+incompatible // indirect
+	github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d // indirect
+	github.com/fatih/camelcase v1.0.0 // indirect
+	github.com/ghodss/yaml v1.0.0 // indirect
+	github.com/go-openapi/spec v0.18.0 // indirect
+	github.com/go-openapi/swag v0.18.0 // indirect
+	github.com/go-yaml/yaml v2.1.0+incompatible
+	github.com/gogo/protobuf v1.2.1 // indirect
+	github.com/google/btree v1.0.0 // indirect
+	github.com/googleapis/gnostic v0.2.0 // indirect
+	github.com/gregjones/httpcache v0.0.0-20190212212710-3befbb6ad0cc // indirect
+	github.com/imdario/mergo v0.3.7 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.5 // indirect
+	github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de // indirect
+	github.com/lithammer/dedent v1.1.0 // indirect
+	github.com/mailru/easyjson v0.0.0-20190221075403-6243d8e04c3f // indirect
+	github.com/mitchellh/go-wordwrap v1.0.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0-rc1 // indirect
+	github.com/pkg/errors v0.8.1
+	github.com/russross/blackfriday v0.0.0-20151117072312-300106c228d5 // indirect
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	github.com/sirupsen/logrus v1.3.0 // indirect
+	github.com/spf13/afero v1.2.2 // indirect
+	github.com/spf13/cobra v0.0.3
+	github.com/spf13/pflag v1.0.3
+	github.com/xlab/handysort v0.0.0-20150421192137-fb3537ed64a1 // indirect
+	golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2
+	golang.org/x/net v0.0.0-20190213061140-3a22650c66bd // indirect
+	golang.org/x/oauth2 v0.0.0-20190220154721-9b3c75971fc9 // indirect
+	golang.org/x/time v0.0.0-20181108054448-85acf8d2951c // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.2.2 // indirect
+	k8s.io/api v0.0.0-20190409092523-d687e77c8ae9
+	k8s.io/apiextensions-apiserver v0.0.0-20190315093550-53c4693659ed // indirect
+	k8s.io/apimachinery v0.0.0-20190409092423-760d1845f48b
+	k8s.io/cli-runtime v0.0.0-20190314001948-2899ed30580f // indirect
+	// client-go is master branch see https://github.com/kubernetes/kubernetes/issues/76304
+	k8s.io/client-go v0.0.0-20190409092706-ca8df85b1798
+	k8s.io/cloud-provider v0.0.0-20190405093944-6c8b65ee8f98 // indirect
+	k8s.io/cluster-bootstrap v0.0.0-20190314002537-50662da99b70
+	k8s.io/klog v0.2.0
+	k8s.io/kube-proxy v0.0.0-20190314002154-4d735c31b054 // indirect
+	k8s.io/kubelet v0.0.0-20190314002251-f6da02f58325 // indirect
+	k8s.io/kubernetes v1.14.0
+	sigs.k8s.io/kustomize v2.0.3+incompatible // indirect
+	vbom.ml/util v0.0.0-20180919145318-efcd4e0f9787 // indirect
+)
+
+//fix for https://github.com/kubernetes-sigs/controller-runtime/issues/219
+exclude github.com/Sirupsen/logrus v1.4.1
+
+exclude github.com/Sirupsen/logrus v1.4.0
+
+exclude github.com/Sirupsen/logrus v1.3.0
+
+exclude github.com/Sirupsen/logrus v1.2.0
+
+exclude github.com/Sirupsen/logrus v1.1.1
+
+exclude github.com/Sirupsen/logrus v1.1.0
+
+exclude github.com/renstrom/dedent v1.1.0