Prepare release v1.7.15
Prepare release v1.7.15

vdemeester/traefik,dtomcej/traefik,FriggaHel/traefik,FriggaHel/traefik,dtomcej/traefik,mmatur/traefik,ldez/traefik,SantoDE/traefik,containous/traefik,mmatur/traefik,ldez/traefik,containous/traefik,SantoDE/traefik,containous/traefik,mmatur/traefik,vdemeester/traefik,ldez/traefik,SantoDE/traefik,FriggaHel/traefik,vdemeester/traefik,vdemeester/traefik,dtomcej/traefik,containous/traefik,FriggaHel/traefik,mmatur/traefik,SantoDE/traefik,ldez/traefik,dtomcej/traefik