Migrate to CRDs, Kubebuilder and Kustomize (#126)

* Remove cluster/machine actuators

* Update Gopkg files

* Sync vendor directory

* Sync boilerplate

* Update Makefile to use go generate

* Delete old ProviderConfig types

* Add new ProviderConfig types based on CRDs

* Remove leftovers from Cluster and Machine Controllers

* Refactor ClusterActuator to utilize CRDs

* Refactor MachineActuator to utilize CRDs

* Refactor clusterctl to use new controller/manager

* Add AddToManager functions

* Implement Manager

* Add Dockerfile for the Manager binary

* Update example scripts to be compatible with Kustomize

* Update Makefile to be compatible with Kubebuilder

* Add Kustomize support

* HACK: disable kubeadm token generation

* Refactor Makefile to make it compatible with old one

* Update gometalinter.json

* Update license headers

* Update documentation to reflect CRDs changes

* Remove outdated TODO markers

* FIX: fix kubeadm token generation

* TYPO: fix typo in README

* FIX: InstanceStatus is correctly updated

* Update scripts to use new Docker repository

* Update Makefile to automatically update Manager manifest with correct image

* Set correct image tag in the manifest

Dockerfile

@@ -0,0 +1,38 @@
+# Copyright 2018 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Build the manager binary
+FROM golang:1.10.3 as builder
+
+# Copy in the go src
+WORKDIR /go/src/sigs.k8s.io/cluster-api-provider-digitalocean
+COPY pkg/    pkg/
+COPY cmd/    cmd/
+COPY vendor/ vendor/
+
+# Build
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o manager sigs.k8s.io/cluster-api-provider-digitalocean/cmd/manager
+
+FROM ubuntu:latest as kubeadm
+RUN apt-get update
+RUN apt-get install -y curl
+RUN curl -fsSL https://dl.k8s.io/release/v1.11.2/bin/linux/amd64/kubeadm > /usr/bin/kubeadm
+RUN chmod a+rx /usr/bin/kubeadm
+
+# Copy the controller-manager into a thin image
+FROM ubuntu:latest
+WORKDIR /
+COPY --from=builder /go/src/sigs.k8s.io/cluster-api-provider-digitalocean/manager .
+COPY --from=kubeadm /usr/bin/kubeadm /usr/bin/kubeadm
+ENTRYPOINT ["/manager"]