Fixes to get mysql-test-run more portable

Docs/manual.texi:
  More examples based on user comments
client/mysqltest.c:
  Added --sleep and --tmpdir
mysql-test/README:
  Update
mysql-test/include/master-slave.inc:
  Fixed to not be dependent on path to sockets
mysql-test/install_test_db.sh:
  Added privilege for hostname%
mysql-test/mysql-test-run.sh:
  Portability fixes + a lot of new options
mysql-test/r/bigint.result:
  Made test portable
mysql-test/t/bigint.test:
  Made test portable
mysql-test/t/rpl000008.test:
  Changed sleeptime
mysql-test/t/rpl000012.test:
  Fixed to not be dependent on path to sockets
mysql-test/t/rpl000013.test:
  Fixed to not be dependent on path to sockets
mysql-test/t/rpl000014.test:
  Fixed to not be dependent on path to sockets
mysql-test/t/rpl000015.test:
  Fixed to not be dependent on path to sockets
mysql-test/t/rpl000016.test:
  Fixed to not be dependent on path to sockets