Zabbix

A......... [DEV-3009] introduced clamping for mitigation of timing attacks

* commit '2095c0a9faa8fc925b4f52fe8e0e3d4ba37746a4':
  .......... [DEV-3009] updated error message in autotest
  A......... [DEV-3009] made time equalizing managable for LDAP case; replaced displaying custom LDAP system errors with main login error message
  A......... [DEV-3009] prevented ability to determine whether user with the given username exists in system or not by different types of error messages
  A......... [DEV-3009] changed delay approach
  A......... [DEV-3009] moved check of disabled user's groups after password verification; improved code readability; removed redundant delays
  A......... [DEV-3009] introduced clamping for mitigation of timing attacks