Check if the DHCP server associated with a vboxnet is enabled.

        :param vboxnet: vboxnet name

        :returns: boolean

def _check_dhcp_server(self, vboxnet):
        """
        Check if the DHCP server associated with a vboxnet is enabled.

        :param vboxnet: vboxnet name

        :returns: boolean
        """

        properties = yield from self._execute("list", ["dhcpservers"])
        flag_dhcp_server_found = False
        for prop in properties.splitlines():
            try:
                name, value = prop.split(':', 1)
            except ValueError:
                continue
            if name.strip() == "NetworkName" and value.strip().endswith(vboxnet):
                flag_dhcp_server_found = True
            if flag_dhcp_server_found and name.strip() == "Enabled":
                if value.strip() == "Yes":
                    return True
        return False