added --bench option
sql-bench/Makefile.am
    added bench-count-distinct.sh test
sql-bench/bench-init.pl.sh
    added --socket option


mysql-test/mysql-test-run.sh:
  added --bench option
sql-bench/Makefile.am:
  added bench-count-distinct.sh test
sql-bench/bench-init.pl.sh:
  added --socket option
sql-bench/server-cfg.sh:
  --socket
BitKeeper/etc/ignore:
  Added sql-bench/bench-count-distinct to the ignore list