tests: introduce e2e suite (#422)

* mock: implement GetStatsSummary

Signed-off-by: Paulo Pires <pjpires@gmail.com>

* make: use skaffold to deploy vk

Signed-off-by: Paulo Pires <pjpires@gmail.com>

* test: add an e2e test suite

Signed-off-by: Paulo Pires <pjpires@gmail.com>

* test: add vendored code

Signed-off-by: Paulo Pires <pjpires@gmail.com>

* docs: update README.md

Signed-off-by: Paulo Pires <pjpires@gmail.com>

* ci: run e2e on circleci

Signed-off-by: Paulo Pires <pjpires@gmail.com>

* make: improve the skaffold target

Signed-off-by: Paulo Pires <pjpires@gmail.com>

* e2e: fix defer pod deletion

Signed-off-by: Paulo Pires <pjpires@gmail.com>

* e2e: improve instructions

Signed-off-by: Paulo Pires <pjpires@gmail.com>

* makefile: default shell is bash

Signed-off-by: Paulo Pires <pjpires@gmail.com>

hack/skaffold/virtual-kubelet/pod.yml

@@ -0,0 +1,26 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: vkubelet-mock-0
+spec:
+  containers:
+  - name: vkubelet-mock-0
+    image: virtual-kubelet
+    # "IfNotPresent" is used to prevent Minikube from trying to pull from the registry (and failing) in the first place.
+    imagePullPolicy: IfNotPresent
+    args:
+    - /virtual-kubelet
+    - --nodename
+    - vkubelet-mock-0
+    - --provider
+    - mock
+    - --provider-config
+    - /vkubelet-mock-0-cfg.json
+    ports:
+    - name: metrics
+      containerPort: 10255
+    readinessProbe:
+      httpGet:
+        path: /stats/summary
+        port: metrics
+  serviceAccountName: virtual-kubelet