Corrected sysctl part and added missing nova_user_password

Hi, 
as I wanted to use your installation, I ran into two small problems. The first was, that the sysctl part could not be applied. I changed to another puppet-sysctl module (after some struggle) and also added v6 forwarding. 
The second problem was, that nova_user_password was missing on the compute node. 

Feel free to apply
Greetings
hrzbrg