[#1024] Added ChangeLog for #1024

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+1707.  [func]          marcin
+       High Availability hooks library supports controlled maintenance
+       of the servers. The new ha-maintenance-start command puts one
+       of the servers in the partner-in-maintenance state and causes
+       this server to take over the entire DHCP traffic directed to the
+       HA service. The second server in the in-maintenance state can be
+       safely shutdown for the maintenance. This new mechanism solves
+       the problem present in earlier versions of Kea when the
+       administrator had to rely on the failover mechanism to promote
+       one of the servers to handle the DHCP traffic while the other
+       server was down.
+       (Gitlab #1024)
+
 1706.  [bug]           fdupont
        Fixed BOOTP hook. It now properly handles BOOTP packets and sends
        valid responses.