rebase on an early commit of #250 and implement e2e tests

Signed-off-by: Bryce Palmer <[email protected]>

Author: everettraven

testdata/bundles/plain-v0/plain.v0.1.0/Dockerfile

@@ -0,0 +1,2 @@
+FROM scratch
+COPY manifests /manifests

testdata/bundles/plain-v0/plain.v0.1.0/manifests/configmap.yaml

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+# This configmap was pulled straight from the Kubernetes docs
+# and can be found at https://kubernetes.io/docs/concepts/configuration/configmap/
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: game-demo
+data:
+  # property-like keys; each key maps to a simple value
+  player_initial_lives: "3"
+  ui_properties_file_name: "user-interface.properties"
+
+  # file-like keys
+  game.properties: |
+    enemy.types=aliens,monsters
+    player.maximum-lives=5    
+  user-interface.properties: |
+    color.good=purple
+    color.bad=yellow
+    allow.textmode=true