vendor: patch github.com/mitchellh/cli until help output is fixed

We need to init the flagset that cli uses to generate the help
outside of the Run method since Run isn't called anymore for
printing help.

vendor/github.com/mitchellh/cli/cli.go

@@ -398,12 +398,6 @@ func (c *CLI) processArgs() {
 			break
 		}
 
-		// Check for help flags.
-		if arg == "-h" || arg == "-help" || arg == "--help" {
-			c.isHelp = true
-			continue
-		}
-
 		if c.subcommand == "" {
 			// Check for version flags if not in a subcommand.
 			if arg == "-v" || arg == "-version" || arg == "--version" {
@@ -411,6 +405,12 @@ func (c *CLI) processArgs() {
 				continue
 			}
 
+			// Check for help flags.
+			if arg == "-h" || arg == "-help" || arg == "--help" {
+				c.isHelp = true
+				continue
+			}
+
 			if arg != "" && arg[0] == '-' {
 				// Record the arg...
 				c.topFlags = append(c.topFlags, arg)