fixed sync bugs in three test cases
added offset argument to sync_with_master to mysqltest to be able to fix sync bugs
added a test case for slave startup with existing master.info
expanded mysql-test-run.sh to be able to run pre-start shell script initializations
client/mysqltest.c:
added offset argument to sync_with_master
mysql-test/mysql-test-run.sh:
added option to run master or slave initialization shell script
mysql-test/r/rpl000016.result:
fixed bug in test case
mysql-test/t/rpl000012.test:
fixed syncronization bug
mysql-test/t/rpl000013.test:
fixed sync bug
mysql-test/t/rpl000016.test:
fixed ambiguous show slave status.
sql/slave.cc:
fixed bug that broke slave server start with existing master.info,
Monty's optimization was not chopping off newline from logname.
