The “ Black Doves ” are expanding. Season 2 of Netflix’s pulpy London spy thriller series — created by Joe Barton, led by Keira Knightley and also starring Ben Whishaw and Sarah Lancashire — is now in production, and has recruited more names into it secretive, and rather violent, ranks. Ambika Mod (“One Day”) joins the show as Laila, an acerbic and anarchic Black Doves agent who is sent to help Knightley’s agent Helen on a mission. Meanwhile, Babou Ceesay (“Alien: Earth”) plays Mr. Conteh, a