[master] Added Changelog for #5647.

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+1425.  [bug]           marcin
+       Improved performance of the DHCP server running in High
+       Availability configuration by optimizing the management of
+       CalloutHandle objects passed to the callouts.
+       (Trac #5647, git eea88d5c8f4d8efb6c5bfdfbf4e070a90069db5d)
+
 1424.  [doc]           marcin
        List of hooks libraries provided by ISC includes an
        information which Kea servers the libraries can be attached