Update vst-install-debian.sh

install/vst-install-debian.sh

@@ -533,6 +533,7 @@ wget $CHOST/$VERSION/sudoers.conf -O /etc/sudoers
 wget $CHOST/$VERSION/sudoers.admin.conf -O /etc/sudoers.d/admin
 chmod 440 /etc/sudoers
 chmod 440 /etc/sudoers.d/admin
+echo 'Defaults:admin !syslog' >>/etc/sudoers.d/admin
 
 # NTP Synchronization
 echo '#!/bin/sh' > /etc/cron.daily/ntpdate