added zabbix-agent install

assets/zabbix/apt.conf

@@ -0,0 +1,6 @@
+# Treat security and regular updates differently
+# This is just a simulation, that can be run under zabbix user
+# Since updating packages lists (apt-get update) requires root user,
+# use APT::Periodic or some other functionality for that
+UserParameter=apt.security,apt-get -s upgrade | grep -ci ^inst.*security | tr -d '\n'
+UserParameter=apt.updates,apt-get -s upgrade | grep -iPc '^Inst((?!security).)*$' | tr -d '\n'