Adding skeleton for the drain command.

cmd/drain.go

@@ -0,0 +1,27 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(drainCmd)
+}
+
+var drainCmd = &cobra.Command{
+	Use:   "drain [space separated host list]",
+	Short: "Place a list of space separated Mesos Agents into maintenance mode.",
+	Long: `Adds a Mesos Agent to Aurora's Drain list. Agents in this list
+    are not allowed to schedule new tasks and any tasks already running on this Agent
+    are killed and rescheduled in an Agent that is not in maintenance mode. Command
+    expects a space separated list of hosts to place into maintenance mode.`,
+	Args: cobra.MinimumNArgs(1),
+	Run:  drain,
+}
+
+func drain(cmd *cobra.Command, args []string) {
+
+	fmt.Print(args)
+}