Zabbix

.....J.... [DEV-4424] added Zabbix server-based incoming connection restrictions for Java Gateway

* commit 'd12f980c003796bc9bda42a4cc8b428f9bc50a7f':
  .....J.... [DEV-4424] updated SERVER configuration
  .....J.... [DEV-4424] updated unit tests
  .....J.... [DEV-4424] refactored parsing functions
  .....J.... [DEV-4424] updated java gateway
  .....J.... [DEV-4424] added unit tests
  .....J.... [DEV-4424] added dnsjava library
  .....J.... [DEV-4424] added timeout for DNS resolver
  .....J.... [DEV-4424] updated allowed peers
  .....J.... [DEV-4424] updated logger warning messages
  .....J.... [DEV-4424] updated allowed peers list matching
  .....J.... [DEV-4424] added incoming connection validation logic
  .....J.... [DEV-4424] updated configuration manager
  .....J.... [DEV-4424] updates startup.sh with new conf parameter
  .....J.... [DEV-4424] added "SERVER" configuration property