By Patrick Andres Eagles chief security officer “Big Dom” DiSandro unwittingly graduated to household name status on Sunday, involving himself in a sideline altercation with 49ers linebacker Dre Greenlaw that resulted in two ejections. Days after the encounter, the NFL circulated a memo to its 32 teams Wednesday warning against similar incidents in the future. “Please ensure that all members of your game-day staff understand that their role does not extend to being involved with game day altercations and that they must refrain from such involvement,” the league wrote. The league added that “un…