Update vmware/govmomi godeps

vendor/github.com/vmware/govmomi/simulator/os_unix.go

@@ -0,0 +1,38 @@
+/*
+Copyright (c) 2017 VMware, Inc. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package simulator
+
+import "syscall"
+
+func (ds *Datastore) stat() error {
+	info := ds.Info.GetDatastoreInfo()
+	var stat syscall.Statfs_t
+
+	err := syscall.Statfs(info.Url, &stat)
+	if err != nil {
+		return err
+	}
+
+	bsize := uint64(stat.Bsize) / 512
+
+	info.FreeSpace = int64(stat.Bfree*bsize) >> 1
+
+	ds.Summary.FreeSpace = info.FreeSpace
+	ds.Summary.Capacity = int64(stat.Blocks*bsize) >> 1
+
+	return nil
+}