Update vendor

vendor/github.com/cloudfoundry/gosigar/sigar_unix.go

@@ -0,0 +1,26 @@
+// Copyright (c) 2012 VMware, Inc.
+
+// +build darwin freebsd linux netbsd openbsd
+
+package sigar
+
+import "syscall"
+
+func (self *FileSystemUsage) Get(path string) error {
+	stat := syscall.Statfs_t{}
+	err := syscall.Statfs(path, &stat)
+	if err != nil {
+		return err
+	}
+
+	bsize := stat.Bsize / 512
+
+	self.Total = (uint64(stat.Blocks) * uint64(bsize)) >> 1
+	self.Free = (uint64(stat.Bfree) * uint64(bsize)) >> 1
+	self.Avail = (uint64(stat.Bavail) * uint64(bsize)) >> 1
+	self.Used = self.Total - self.Free
+	self.Files = stat.Files
+	self.FreeFiles = stat.Ffree
+
+	return nil
+}