Use apiextension v1

- upgrade from apiextension v1beta1 to v1
 - generate yaml manifest for crd intead of applying it at runtime
  - users will have to apply the manifest with kubectl
 - kg and kgctl log an error if the crd is not present
 - now validation should actually work

Signed-off-by: leonnicolas <leonloechner@gmx.de>

vendor/github.com/mattn/go-isatty/go.mod

@@ -0,0 +1,5 @@
+module github.com/mattn/go-isatty
+
+go 1.12
+
+require golang.org/x/sys v0.0.0-20200116001909-b77594299b42