Revert "modify chat app name in configuration"

This reverts commit 26266b9944cc9a129418b8b47d3891debbc01f27.
Revert "Using Addon container to display ChatNotificationApplication portlet"

This reverts commit 35cbac32be7c4b7f16d7aa853df5403972f09a1e.
CHAT-28 Using Addon container to display ChatNotificationApplication portlet