Use Kubernetes package version 1.10. (#74)

Had to use them as [[overrides]] and not directly as [[constraints]] because
argo still uses version v1.9.

Testing done:

1. Builds worked just fine.
2. Unit tests worked just fine.
3. Ran the controller and a couple of sensors. They worked too.

Gopkg.toml

@@ -21,22 +21,10 @@ required = [
   name = "github.com/golang/protobuf"
   version = "v1.1.0"
 
-[[constraint]]
-  name = "k8s.io/api"
-  branch = "release-1.9"
-
-[[constraint]]
-  name = "k8s.io/apimachinery"
-  branch = "release-1.9"
-
 [[constraint]]
   name = "k8s.io/code-generator"
   branch = "release-1.10"
 
-[[constraint]]
-  name = "k8s.io/client-go"
-  branch = "release-6.0"
-
 [[constraint]]
   name = "github.com/eclipse/paho.mqtt.golang"
   version = "1.1.1"
@@ -77,6 +65,18 @@ required = [
   name = "github.com/Shopify/sarama"
   version = "1.16.0"
 
+[[override]]
+  branch = "release-1.10"
+  name = "k8s.io/api"
+
+[[override]]
+  branch = "release-1.10"
+  name = "k8s.io/apimachinery"
+
+[[override]]
+  branch = "release-7.0"
+  name = "k8s.io/client-go"
+
 [[override]]
   name = "github.com/micro/go-plugins"
   branch = "master"