Jan 19 (Reuters) - China's securities regulator has asked brokers to remove client-dedicated servers from data centers in local exchanges, a move that will deprive rapid-trading "flash boys" of an edge against other investors, people with knowledge of the matter said. High-frequency traders in China have long used servers situated at data centers run ​by futures and stock exchanges and owned by brokers to execute trades as the physical adjacency shaves off milliseconds or even microseconds. The tighteni ...