A Nashville real estate firm faces allegations that it forged documents and committed fraud to snatch up distressed Middle Tennessee properties at bargain prices. In a civil complaint filed in Davidson County Chancery Court last week, plaintiffs argue REO Holdings LLC and its principals — Charles Walker, Jon Paul Johnson, Julie Coone and Merdan Ibrahim — led a scheme to illegally acquire properties through the state’s property-tax sales redemption process. According to the 133-page complaint,…