If you’ve sensed lately that there are more homeless people on the streets -- living in tents under freeway overpasses, begging on street corners and sleeping in their cars -- than in past years, sadly, you’re right. Official numbers say homelessness increased by 12 percent in L.A. County over the past two years, to nearly 42,000. Many of them are veterans. Mayor Eric Garcetti has promised to give homeless veterans in the city a place to live by the end of the year. But how much of a dent will that make in the bigger problem, and how is it being accomplished?