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

vendor/github.com/ncw/swift/README.md

@@ -150,3 +150,5 @@ Contributors
 - Arthur Paim Arnold <arthurpaimarnold@gmail.com>
 - Bruno Michel <bmichel@menfin.info>
 - Charles Hsu <charles0126@gmail.com>
+- Omar Ali <omarali@users.noreply.github.com>
+- Andreas Andersen <andreas@softwaredesign.se>

vendor/github.com/ncw/swift/compatibility_1_6.go

@@ -0,0 +1,21 @@
+// +build go1.6
+
+package swift
+
+import (
+	"net/http"
+	"time"
+)
+
+const IS_AT_LEAST_GO_16 = true
+
+func SetExpectContinueTimeout(tr *http.Transport, t time.Duration) {
+	tr.ExpectContinueTimeout = t
+}
+
+func AddExpectAndTransferEncoding(req *http.Request, hasContentLength bool) {
+	req.Header.Add("Expect", "100-continue")
+	if !hasContentLength {
+		req.TransferEncoding = []string{"chunked"}
+	}
+}

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) {}

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

@@ -423,12 +423,15 @@ func (c *Connection) setDefaults() {
 		c.Timeout = 60 * time.Second
 	}
 	if c.Transport == nil {
-		c.Transport = &http.Transport{
+		t := &http.Transport{
 			//		TLSClientConfig:    &tls.Config{RootCAs: pool},
 			//		DisableCompression: true,
-			Proxy:               http.ProxyFromEnvironment,
-			MaxIdleConnsPerHost: 2048,
+			Proxy: http.ProxyFromEnvironment,
+			// Half of linux's default open files limit (1024).
+			MaxIdleConnsPerHost: 512,
 		}
+		SetExpectContinueTimeout(t, 5*time.Second)
+		c.Transport = t
 	}
 	if c.client == nil {
 		c.client = &http.Client{
@@ -720,6 +723,10 @@ func (c *Connection) Call(targetUrl string, p RequestOpts) (resp *http.Response,
 		}
 		req.Header.Add("User-Agent", c.UserAgent)
 		req.Header.Add("X-Auth-Token", authToken)
+
+		_, hasCL := p.Headers["Content-Length"]
+		AddExpectAndTransferEncoding(req, hasCL)
+
 		resp, err = c.doTimeoutRequest(timer, req)
 		if err != nil {
 			if (p.Operation == "HEAD" || p.Operation == "GET") && retries > 0 {