Revert "Removed SQL password in sql_connection for compute hosts"

This reverts commit 621822bed73b5ad0fbe6b0de9f2857c9966c8c04.

Looks like the password is required during setup
Invalid db connection mysql://nova@<host>/nova at
/var/tmp/packstack/<uuid>/modules/nova/manifests/init.pp:153
on node <host>

Change-Id: I9e2aaf28e6840241c35d24847b51b439eb67b88a