Turn off retries on CLI (#4918)

For the CLI it just ends up confusing people as to why it's "hanging"
before returning a 500. This can still be overridden with
VAULT_MAX_RETRIES.

command/base.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"os"
 	"regexp"
 	"strings"
 	"sync"
@@ -88,6 +89,11 @@ func (c *BaseCommand) Client() (*api.Client, error) {
 		return nil, errors.Wrap(err, "failed to create client")
 	}
 
+	// Turn off retries on the CLI
+	if os.Getenv(api.EnvVaultMaxRetries) == "" {
+		client.SetMaxRetries(0)
+	}
+
 	// Set the wrapping function
 	client.SetWrappingLookupFunc(c.DefaultWrappingLookupFunc)