[Users] shutdown VM and 1 minute wait time

Hello, I have oVirt 3.2.1 and a CentOS 6.4 guest with rhev-agent-2.3.16-6.el6.x86_64. If I run shutdow (red square button) from the admin gui I get the equivalent of shutdown -h +1 Is there any config parameter I can set to have immediately shutdown in place without waiting for one minute by default (so "shutdown -h now")? Gianluca