A funeral home owner upset with another company allegedly shot dead a pallbearer during the burial of a 10-year-old girl who died in a drive-by shooting in Washington, DC, on Mother’s Day.   Arianna Davis (pictures below), who was shot while asleep in her family’s car on May 14 and later died, was being buried at Washington National Cemetery in Suitland on Tuesday, June 6 when gunfire erupted, according to reports by NBC Washington.   Wilson Chavis, 48, the owner …