Knight Capital Group Inc., which is being acquired by Getco LLC, plans to sell its credit-brokerage unit to Stifel Financial Corp. The unit includes investment-grade, high-yield and asset- and mortgage-backed debt brokers in the U.S. and Europe, Bloomberg reports. Jersey City, New Jersey-based Knight hired Bank of America Corp. to help sell the unit. Earlier this month, Stifel completed its planned $575 million buyout of New York-based KBW Inc. Since Ron Kruszewski became chief executive in 1997,…