Check if an environment is exposed by comparing it against a whitelist
        and blacklist.

def env_is_exposed(self, tgt_env):
        '''
        Check if an environment is exposed by comparing it against a whitelist
        and blacklist.
        '''
        return salt.utils.stringutils.check_whitelist_blacklist(
            tgt_env,
            whitelist=self.saltenv_whitelist,
            blacklist=self.saltenv_blacklist,
        )