Bombardier is considering selling a stake in any of its multiple business units in order to finance the completion of its CSeries jet, a decision that may lead to private equity involvement in the Montreal-based conglomerate.  The company had previously suggested it would be willing to sell a stake in its rail unit. Now, it has hired investment bankers to explore other options and is reportedly willing to consider a wide range of alternatives, including full or partial sales of business lines, bringing in private equity investors, or forming joint ventures.  Bombardier hopes to close on a financing arrangement, potentially...