Delete .terraform cache

Terraform will pull and cache config.  This causes issues if you
try to change remotes as the cache will be pushed to your remote
when it initializes the new remote.

main.go

@@ -38,12 +38,14 @@ func main() {
 		commands = append(commands, installCaCert(vargs.Cacert))
 	}
 	if remote.Backend != "" {
+		commands = append(commands, deleteCache())
 		commands = append(commands, remoteConfigCommand(remote))
 	}
 	commands = append(commands, planCommand(vargs.Vars))
 	if !vargs.Plan {
 		commands = append(commands, applyCommand())
 	}
+	commands = append(commands, deleteCache())
 
 	for _, c := range commands {
 		c.Env = os.Environ()
@@ -72,6 +74,14 @@ func installCaCert(cacert string) *exec.Cmd {
 	)
 }
 
+func deleteCache() *exec.Cmd {
+	return exec.Command(
+		"rm",
+		"-rf",
+		".terraform",
+	)
+}
+
 func remoteConfigCommand(config remote) *exec.Cmd {
 	args := []string{
 		"remote",