added snmp package; added suid to fping

zabbix/Dockerfile

     dpkg -i /tmp/zabbix.deb
 
 RUN apt-get update && apt-get -y install\
-        zabbix-server-pgsql &&\
+        zabbix-server-pgsql\
+        snmp &&\
         apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 RUN chown -R zabbix:zabbix /etc/zabbix &&\
     chown zabbix:zabbix /var/log/zabbix/ &&\
     ln -s /dev/stdout /var/log/zabbix/zabbix_server.log
 
+RUN chmod u+s /usr/bin/fping &&\
+    chmod u+s /usr/bin/fping6
+
 COPY ./zabbix_server.conf /etc/zabbix/zabbix_server.conf
 
 COPY ./vars-vars /etc/vars-vars