Gets the path to the CA certificate that issued a given user keypair.

        Args:
            name (str): The name of the user keypair.

        Examples:
            Get the path to the CA cert which issue the cert for "myuser":

                mypath = cdir.getUserCaPath('myuser')

        Returns:
            str: The path if exists.

def getUserCaPath(self, name):
        '''
        Gets the path to the CA certificate that issued a given user keypair.

        Args:
            name (str): The name of the user keypair.

        Examples:
            Get the path to the CA cert which issue the cert for "myuser":

                mypath = cdir.getUserCaPath('myuser')

        Returns:
            str: The path if exists.
        '''
        cert = self.getUserCert(name)
        if cert is None:
            return None

        return self._getCaPath(cert)