Add Error injection hooks for rename table

This allows us to re-introduce rename_concurrent test (correctly)

# What happens if other statement sneaks in after the table
# creation but before its opening ?
set session debug="-d,sleep_create_select_before_create:+d,sleep_create_select_before_open";
# Concurrent DROP TABLE
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
drop table t1;
connection default;
--reap
# Concurrent RENAME TABLE
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
rename table t1 to t2;
connection default;
--reap