Move supervisor to it's own package

It allows to keep main namespace cleaner

Signed-off-by: Alexander Morozov <lk4d4@docker.com>

supervisor/machine.go

@@ -0,0 +1,26 @@
+package supervisor
+
+import "github.com/cloudfoundry/gosigar"
+
+type Machine struct {
+	ID     string
+	Cpus   int
+	Memory int64
+}
+
+func CollectMachineInformation(id string) (Machine, error) {
+	m := Machine{
+		ID: id,
+	}
+	cpu := sigar.CpuList{}
+	if err := cpu.Get(); err != nil {
+		return m, err
+	}
+	m.Cpus = len(cpu.List)
+	mem := sigar.Mem{}
+	if err := mem.Get(); err != nil {
+		return m, err
+	}
+	m.Memory = int64(mem.Total)
+	return m, nil
+}