gateway/manta: Bump manta dependencies (#5414)

Internally, triton-go, what manta minio is built on, changed it's internal
error handling. This means we no longer need to unwrap specific error types

This doesn't change any manta minio functionality - it just changes how errors are
handled internally and adds a wrapper for a 404 error

vendor/github.com/joyent/triton-go/version.go

@@ -0,0 +1,32 @@
+//
+// Copyright (c) 2018, Joyent, Inc. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+//
+
+package triton
+
+import (
+	"fmt"
+	"runtime"
+)
+
+// The main version number of the current released Triton-go SDK.
+const Version = "0.9.0"
+
+// A pre-release marker for the version. If this is "" (empty string)
+// then it means that it is a final release. Otherwise, this is a pre-release
+// such as "dev" (in development), "beta", "rc1", etc.
+var Prerelease = ""
+
+func UserAgent() string {
+	if Prerelease != "" {
+		return fmt.Sprintf("triton-go/%s-%s (%s-%s; %s)", Version, Prerelease, runtime.GOARCH, runtime.GOOS, runtime.Version())
+	} else {
+		return fmt.Sprintf("triton-go/%s (%s-%s; %s)", Version, runtime.GOARCH, runtime.GOOS, runtime.Version())
+	}
+}
+
+const CloudAPIMajorVersion = "8"