GatewayManager: return all gateways if all are marked dead (#5813)
GatewayManager: return all gateways if all are marked dead (#5813)


yevhen/orleans,amccool/orleans,sergeybykov/orleans,ibondy/orleans,benjaminpetit/orleans,galvesribeiro/orleans,ElanHasson/orleans,hoopsomuah/orleans,yevhen/orleans,sergeybykov/orleans,ibondy/orleans,ElanHasson/orleans,dotnet/orleans,hoopsomuah/orleans,veikkoeeva/orleans,waynemunro/orleans,galvesribeiro/orleans,jason-bragg/orleans,dotnet/orleans,waynemunro/orleans,amccool/orleans,jthelin/orleans,ReubenBond/orleans,amccool/orleans