For all the recent “The Longhorns Are Back!” talk, the revitalization of the University of Texas’s football program might be the second most intriguing comeback story of Steve Sarkisian’s time in Austin. Just a decade ago, Sark, as friends and fans call him, was regarded as a wunderkind, having energized a dormant University of Washington team and then taken the reins at the University of Southern California, in 2014. But at USC he flamed out spectacularly, showing up drunk to athletic department events before being fired in the middle of his second season.Sarkisian got sober, and University of Alabama coach Nick Saban offered him a lifeline: a $30,000-a-year job as an offensive analyst. From there, Sarkisian rebuilt his reputation and, as Saban’s offensive coordinator in…