Zabbix

...G...... [DEV-4657] refactored and added validation to docker plugin in agent2

* commit 'dae278b38c8a9f3aaf2f77114358ecfe778c966f':
  ...G...... [DEV-4657] fixed regex comment
  ...G...... [DEV-4657] removed name limit of 63 characters for docker container name.
  ...G...... [DEV-4657] added support for old template discovery naming.
  ...G...... [DEV-4657] fixed copyright year
  ...G...... [DEV-4657] style fix, parameter passing error fix.
  ...G...... [DEV-4657] style adjustments
  ...G...... [DEV-4657] style adjustments
  ...G...... [DEV-4657] added tags to the field structure
  ...G...... [DEV-4657] lint error fixes
  ...G...... [DEV-4657] refactored and added validation