Add initial code for sadis-server.

Change-Id: Iaa8d6ddf888c04abc8eee5933c0c7401c0094394
diff --git a/vendor/github.com/Sirupsen/logrus/terminal_appengine.go b/vendor/github.com/Sirupsen/logrus/terminal_appengine.go
new file mode 100644
index 0000000..1960169
--- /dev/null
+++ b/vendor/github.com/Sirupsen/logrus/terminal_appengine.go
@@ -0,0 +1,8 @@
+// +build appengine
+
+package logrus
+
+// IsTerminal returns true if stderr's file descriptor is a terminal.
+func IsTerminal() bool {
+	return true
+}