Resolution # 1
If the file does not exist you likely need to join the machine to Active Directory. For information on joining please see the vastool man pages in this article.
Alternatively you can use the Administrator's guide located here.
Resolution # 2
Permissions on the vas.conf should look like this.
# ls -la /etc/opt/quest/vas/vas.conf
-rw-r--r-- 1 root root 802 Feb 21 14:51 /etc/opt/quest/vas/vas.conf