updated to zabbix 3.4

frontend/Dockerfile

         wget &&\
         apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-ARG ZABBIX_VERSION=3.2
+ARG ZABBIX_VERSION=3.4
 
 RUN wget http://repo.zabbix.com/zabbix/${ZABBIX_VERSION}/debian/pool/main/z/zabbix-release/zabbix-release_${ZABBIX_VERSION}-1+jessie_all.deb -O /tmp/zabbix.deb &&\
     dpkg -i /tmp/zabbix.deb

zabbix/Dockerfile

         wget &&\
         apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-ARG ZABBIX_VERSION=3.2
+ARG ZABBIX_VERSION=3.4
 
 RUN wget http://repo.zabbix.com/zabbix/${ZABBIX_VERSION}/debian/pool/main/z/zabbix-release/zabbix-release_${ZABBIX_VERSION}-1+jessie_all.deb -O /tmp/zabbix.deb &&\
     dpkg -i /tmp/zabbix.deb

zabbix/zabbix_server.conf

 
 PidFile=/var/run/zabbix/zabbix_server.pid
 
+### Option: SocketDir
+#	IPC socket directory.
+#       Directory to store IPC sockets used by internal Zabbix services.
+#
+# Mandatory: no
+# Default:
+# SocketDir=/tmp
+
+SocketDir=/var/run/zabbix
+
 ### Option: DBHost
 #	Database host name.
 #	If set to localhost, socket is used for MySQL.
 # Default (for MySQL):
 # DBPort=3306
 
+### Option: HistoryStorageURL
+#	History storage HTTP[S] URL.
+#
+# Mandatory: no
+# Default:
+# HistoryStorageURL=
+
+### Option: HistoryStorageTypes
+#	Comma separated list of value types to be sent to the history storage.
+#
+# Mandatory: no
+# Default:
+# HistoryStorageTypes=uint,dbl,str,log,text
+
 ############ ADVANCED PARAMETERS ################
 
 ### Option: StartPollers
 
 ### Option: StartIPMIPollers
 #	Number of pre-forked instances of IPMI pollers.
+#       The IPMI manager process is automatically started when at least one IPMI poller is started.
 #
 # Mandatory: no
 # Range: 0-1000
 # Default:
 # StartIPMIPollers=0
 
+### Option: StartPreprocessors
+#	Number of pre-forked instances of preprocessing workers.
+#       The preprocessing manager process is automatically started when preprocessor worker is started.
+#
+# Mandatory: no
+# Range: 1-1000
+# Default:
+# StartPreprocessors=3
+
 ### Option: StartPollersUnreachable
 #	Number of pre-forked instances of pollers for unreachable hosts (including IPMI and Java).
 #	At least one poller for unreachable hosts must be running if regular, IPMI or Java pollers
 # Default:
 # StartEscalators=1
 
+### Option: StartAlerters
+#	Number of pre-forked instances of alerters.
+#	Alerters send the notifications created by action operations.
+#
+# Mandatory: no
+# Range: 0-100
+# Default:
+# StartAlerters=3
+
 ### Option: JavaGateway
 #	IP address (or hostname) of Zabbix Java gateway.
 #	Only required if Java pollers are started.
 # Default:
 # SNMPTrapperFile=/tmp/zabbix_traps.tmp
 
+SNMPTrapperFile=/var/log/snmptrap/snmptrap.log
+
 ### Option: StartSNMPTrapper
 #	If 1, SNMP trapper process is started.
 #
 # Default:
 # MaxHousekeeperDelete=5000
 
-### Option: SenderFrequency
-#	How often Zabbix will try to send unsent alerts (in seconds).
-#
-# Mandatory: no
-# Range: 5-3600
-# Default:
-# SenderFrequency=30
-
 ### Option: CacheSize
 #	Size of configuration cache, in bytes.
 #	Shared memory size for storing host, item and trigger data.