Log zabbix-agent to file again

LogType=console fails, since it requires the process to run in the
foreground. For now, log to a file again.

zabbix-agent/templates/zabbix_agentd.conf.j2

@@ -20,7 +20,7 @@ PidFile=/var/run/zabbix/zabbix_agentd.pid
 #
 # Mandatory: no
 # Default:
-LogType=console
+LogType=file
 
 ### Option: LogFile
 #	Log file name for LogType 'file' parameter.
@@ -29,7 +29,7 @@ LogType=console
 # Default:
 # LogFile=
 
-#LogFile=/var/log/zabbix/zabbix_agentd.log
+LogFile=/var/log/zabbix/zabbix_agentd.log
 
 ### Option: LogFileSize
 #	Maximum size of log file in MB.