Scott Kleinman spoke to Bloomberg Television on Wednesday about the private equity return environment.Bloomberg TelevisionApollo's Scott Kleinman warned of a "dry spell" for investors as deals from a friendlier era unwind.Managers must adjust financial projections from deals done in the zero-interest rate era.Investors want their money back, but managers often don't want to sell at a perceived discount.A leading private equity executive just warned that investors are in for a "pretty dry spell for a few years.