Add error message in gather for missing SSH keys.

Error message displays when gather command failed and no ssh keys were passed. The message recommends ensuring ssh keys were in keyring or specifying the key in a flag.

cmd/openshift-install/gather.go

@@ -112,7 +112,9 @@ func runGatherBootstrapCmd(directory string) error {
 func logGatherBootstrap(bootstrap string, port int, masters []string, directory string) error {
 	logrus.Info("Pulling debug logs from the bootstrap machine")
 	client, err := ssh.NewClient("core", fmt.Sprintf("%s:%d", bootstrap, port), gatherBootstrapOpts.sshKeys)
-	if err != nil {
+	if err != nil && len(gatherBootstrapOpts.sshKeys) == 0 {
+		return errors.Wrap(err, "failed to create SSH client, ensure the proper ssh key is in your keyring or specify with --key")
+	} else if err != nil {
 		return errors.Wrap(err, "failed to create SSH client")
 	}
 	if err := ssh.Run(client, fmt.Sprintf("/usr/local/bin/installer-gather.sh %s", strings.Join(masters, " "))); err != nil {