On Wall Street, Steve Feinberg had a well-oiled sales pitch for investors thinking of betting billions on his corporate turnarounds. Now the Pentagon’s No. 2 official, the former private-equity boss faces the biggest sell of his career: persuading Congress to bless the Trump administration’s $1.5 trillion military budget. The massive funding surge would pour into a military plagued by years of costly overruns and painful delays. Feinberg has told Trump administration officials he could avoid those pitfalls using a carrot-and-stick approach with companies on the receiving end of those dollars. “Contractors that are willing to change with us will prosper…