Zabbix

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

* commit 'a3e2070b995a22895b07dc0c7eb014eaf90cea59':
  A......... [DEV-3009] made time equalizing managable for LDAP case; replaced displaying custom LDAP system errors with main login error message
  A......... [DEV-3009] changed time equalizing approach
  A......... [DEV-3009] prevented redundant calls of sleep and usleep functions; improved code readability
  A......... [DEV-3009] deleted equalizing of time for irrelevant login errors
  A......... [DEV-3009] introduced clamping for mitigation of timing attacks