fix debian pass_string

I've got this on Ubuntu 12.04 x64 during installation the cookbook
```
STDOUT: 
STDERR: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
---- End output of /usr/bin/mysql -u root -pilikerandompasswords < /etc/mysql_grants.sql ----
Ran /usr/bin/mysql -u root -pilikerandompasswords < /etc/mysql_grants.sql returned 1
[2014-08-29T15:03:08-04:00] FATAL: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully (exit code 1)
ERROR: RuntimeError: chef-solo failed. See output above.
```
I use `roles` for installation. My json file is available here: https://gist.github.com/itsNikolay/863e0268a52627e8add3

After this fix the cookbook passed to green.