Even though it was expected, the release of the Oklahoma SEC baseball schedule on Thursday served as a small reminder: it ain’t getting any easier. Skip Johnson’s club will roll out the red carpet for four of the last five national champions. Oklahoma is playing host to Mississippi State (March 21-23) in the SEC home-opening series, along with LSU (April 4-6), Vanderbilt (April 11-13), Ole Miss (May 9-11) and Texas (May 15-17). Oklahoma opens its inaugural season in the Southeastern Conference on the road at South Carolina (March 14-16), while also traveling to Alabama (March 28-30), Missouri …