rcpt_to.host_list_base: Replace string concatenations with template literals (#2254)
rcpt_to.host_list_base: Replace string concatenations with template literals (#2254)


msimerson/Haraka,smfreegard/Haraka,smfreegard/Haraka,smfreegard/Haraka,msimerson/Haraka,haraka/Haraka,haraka/Haraka,haraka/Haraka,msimerson/Haraka,smfreegard/Haraka,haraka/Haraka,msimerson/Haraka