MINNEAPOLIS — It doesn't matter where the San Antonio Spurs set up shop. Two things will always be present: Keldon Johnson, and Keldon Johnson's mega-sized boombox. Some days, Mariah Carey is the artist who sees the young squad into battle. Miley Cyrus has made appearances, and quite frequently, Darius Rucker's South Carolina twang has echoed down the hallways deep inside Frost Bank Center. Johnson's music taste is always dance-worthy, but it's the people who join him that encourage him to keep the party going. The Spurs like to move together. "As much as I'm loud and obnoxious and speaking out and things like that," Johnson said, "(my teammates) allow me to be the best version of myself each and every day." Since the beginning of the season, the Spurs have, unsurprisingly, gotten to know each other well. Long game days and travel take up most of their week-to-week schedule, and when they're done, the occasional team dinner doesn't start until sometimes after midnight.…