vendor: pull in github.com/ncw/swift latest to fix reauth on big files

vendor/github.com/ncw/swift/compatibility_not_1_6.go

@@ -0,0 +1,13 @@
+// +build !go1.6
+
+package swift
+
+import (
+	"net/http"
+	"time"
+)
+
+const IS_AT_LEAST_GO_16 = false
+
+func SetExpectContinueTimeout(tr *http.Transport, t time.Duration)          {}
+func AddExpectAndTransferEncoding(req *http.Request, hasContentLength bool) {}