Zabbix

...G...... [ZBXCTR-2] added agent2 PostgreSQL plugin and template

* commit '91bade82e4dbd99025a778fc64ca2b2392cbedae': (43 commits)
  .......... [ZBXCTR-2] moved changelog record to the right directory
  .......... [ZBXCTR-2] removed wrong changelog record
  .......... [ZBXCTR-2] added changelog record
  ...G...... [ZBXCTR-2] add locking to postgres connection closing
  ...G...... [ZBXCTR-2] fixed connection version handling lost during last refactoring
  .......... [ZBXCTR-2]  updated  Postgres template for Zabbix Agent 2 removing stat screen
  ...G...... [ZBXCTR-2] moved connection locks to connection level to prevent failing connection from blocking other checks. Also added timeout to initial connection.
  .......... [ZBXCTR-2]  updated  Postgres template for Zabbix Agent 2 adding screens and triggers
  .......... [ZBXCTR-2]  added Postgres credentials to windows configuration file
  .......... [ZBXCTR-2]  changed tests to build directly with PostgreSQL server
  .......... [ZBXCTR-2]  removed testpool from windows builds because of docker package incompatibility
  ...G...... [ZBXCTR-2] create database name as handler parameters for certain keys
  ...G...... [ZBXCTR-2] fix pgsql.ping: return 0 if server is down
  ...G...... [ZBXCTR-2] increase max params in the key to 4 for every metric
  ...G...... [ZBXCTR-2] update items description and macros for PostgreSQL template for Zabbx Agent 2
  ...G...... [ZBXCTR-2] fixed parsing credentials of item keys  and prevent mixing credentials of item keys and plugin configuration
  ...G...... [ZBXCTR-2] changed error message
  ...G...... [ZBXCTR-2] fixed typos in PostgreSQL plugin section of configuration file
  ...G...... [ZBXCTR-2] fixed url parsing/assembling
  ...G...... [ZBXCTR-2] allow empty username/passwod in url parameters for connection string for PostgreSQL
  ...

(cherry picked from commit 4d3a3da37c26e65d8a2908ed314d9cad419197d6)