Fixed Kerberos SSO Challenge Response

2) Implemented change as per Kalchenko Alexandr (https://community.igniterealtime.org/thread/55544)

fixed MySQL Error 1093 in monitoring plugin ConversationManager & added description

Update default HZ config file to match new schema

Per community feedback here:
https://community.igniterealtime.org/thread/56508

2) fix MySQL Error 1093(can't modify the same table which is used in the SELECT part) in ConversationManager

Hazelcast 3.5.1 update

HazelcastClusterNodeInfo communication has big delay.

Using getHostString() to benefit from not attempting a reverse lookup.
Or will cause very big delay if the ip address doese not have configured
host name.

Update the REST API plugin to version 1.1.2

- Added: CORS to all endpoints

OF-937: OFMeet plugin should define J2EE web-app version in web.xml files

OF-937: OFMeet plugin should define J2EE web-app version in web.xml

OF-936: Plugins build task should fail on error by default.

OF-930 & OF-935 Fixes

OF-930: When a directory is defined by property, that should be used instead of a relative reference.

OF-934: Shared configuration for the Ant javac task should be predefined

Address XSS issues in admin console and monitoring plugin (master)

A number of stored XSS issues were found by Dean Hardcastle during testing of
the monitoring plugin's admin console. These include cases where chatroom
nicknames and message text are not adequately escaped.

OF-933: Initial WebSocket implementation

Allow users to specifiy custom classes to map credentials from certificates

OF-631: Fix upgrade script for SQLServer