helper/vagrant: fix destroy check logic (found by acc tests!)
helper/vagrant: fix destroy check logic (found by acc tests!)

jmetzmeier/otto,sneal/otto,pcssi/otto,hashicorp/otto,jmetzmeier/otto,sneal/otto,sneal/otto,hashicorp/otto,pcssi/otto,pcssi/otto,hashicorp/otto,jmetzmeier/otto,sneal/otto,pcssi/otto,hashicorp/otto,pcssi/otto,sneal/otto,jmetzmeier/otto,jmetzmeier/otto