Update exercise two

Signed-off-by: Lance Chen <cyen0312@gmail.com>
Remove password from /root/.my.cnf

puppet would inject the correct password

Signed-off-by: Lance Chen <cyen0312@gmail.com>
Fix typo

Signed-off-by: Lance Chen <cyen0312@gmail.com>
Merge pull request #8 from Lance0312/master

Update exercise two