RESOLUTION
In the latest Parallels Business Automation - Standard version nameservers IP-addresses to be added to /etc/resolv.conf file inside Containers (VEs) are configured on hardware node properties screen (per every Virtuozzo hardware node):
Top > Service Director > Virtuozzo Manager > Nodes > hardware node name > General settings
in Name Servers for Containers field under Network settings section.
To automatically synchronize new settings with all Containers it should be enough to select Containers on Top > Service Director > Virtuozzo Manager > Containers screen and click on Synchronize button.
Keywords: resolv.conf, nameserver