Update Go AWS SDK to the latest version

vendor/github.com/aws/aws-sdk-go/internal/sdktesting/env.go

@@ -0,0 +1,53 @@
+package sdktesting
+
+import (
+	"os"
+	"runtime"
+	"strings"
+)
+
+// StashEnv stashes the current environment variables except variables listed in envToKeepx
+// Returns an function to pop out old environment
+func StashEnv(envToKeep ...string) func() {
+	if runtime.GOOS == "windows" {
+		envToKeep = append(envToKeep, "ComSpec")
+		envToKeep = append(envToKeep, "SYSTEM32")
+		envToKeep = append(envToKeep, "SYSTEMROOT")
+	}
+	envToKeep = append(envToKeep, "PATH")
+	extraEnv := getEnvs(envToKeep)
+	originalEnv := os.Environ()
+	os.Clearenv() // clear env
+	for key, val := range extraEnv {
+		os.Setenv(key, val)
+	}
+	return func() {
+		popEnv(originalEnv)
+	}
+}
+
+func getEnvs(envs []string) map[string]string {
+	extraEnvs := make(map[string]string)
+	for _, env := range envs {
+		if val, ok := os.LookupEnv(env); ok && len(val) > 0 {
+			extraEnvs[env] = val
+		}
+	}
+	return extraEnvs
+}
+
+// PopEnv takes the list of the environment values and injects them into the
+// process's environment variable data. Clears any existing environment values
+// that may already exist.
+func popEnv(env []string) {
+	os.Clearenv()
+
+	for _, e := range env {
+		p := strings.SplitN(e, "=", 2)
+		k, v := p[0], ""
+		if len(p) > 1 {
+			v = p[1]
+		}
+		os.Setenv(k, v)
+	}
+}