Add Mesos hyperkube minion server

The minion server will
- launch the proxy and executor
- relaunch them when they terminate uncleanly
- logrotate their logs.

It is a replacement for a full-blown init process like s6 which is not necessary
in this case.

contrib/mesos/pkg/hyperkube/hyperkube.go

@@ -17,9 +17,10 @@ limitations under the License.
 package hyperkube
 
 const (
-	KM_APISERVER          = "apiserver"
-	KM_CONTROLLER_MANAGER = "controller-manager"
-	KM_EXECUTOR           = "executor"
-	KM_PROXY              = "proxy"
-	KM_SCHEDULER          = "scheduler"
+	CommandApiserver         = "apiserver"
+	CommandControllerManager = "controller-manager"
+	CommandExecutor          = "executor"
+	CommandMinion            = "minion"
+	CommandProxy             = "proxy"
+	CommandScheduler         = "scheduler"
 )