[dev.icinga.com #12599] Add event stream buffering

This issue has been migrated from Redmine: https://dev.icinga.com/issues/12599

**Created by bsheqa on 2016-08-31 06:57:49 +00:00**

Assignee: _(none)_
Status: _New_ 
Target Version: _2.7.0_
Last Update: _2016-09-28 13:45:51 +00:00 (in Redmine)_

    Backport?: Not yet backported
    Include in Changelog: 1

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Event stream should support a buffer for each queue. Buffersize may be configurable.
