[master] Added ChangeLog entries 1395 and 1396 for 5586 and 5587 respectively

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+1396.  [bug]           tmark
+       The PostgreSQL schema was expanded to include two new tables:
+       lease4-stat and lease6-stat and triggers to update them as leases
+       are modified. This resolves an issue in deployements, where multiple
+       Kea servers share a common PostgreSQL lease database, which made 
+       it difficult to obtain accurate lease statistics. Since these statistics
+       are now tracked by the database, they do not have to be recalculated at
+       startup or following reconfiguration. This may result in less
+       processing overhead during these events. The new statistics will be
+       accessible via a new Hooks library, being developed for Kea 1.4 
+       under #5589. 
+       (Trac #5587, git 36a0160de0df7789eea224954717be05c08638b7)
+
+1395.  [bug]           tmark
+       The MySQL schema was expanded to include two new tables:
+       lease4-stat and lease6-stat and triggers to update them as leases
+       are modified. This resolves an issue in deployements, where multiple
+       Kea servers share a common MySQL lease database, which made it difficult
+       to obtain accurate lease statistics. Since these statistics are now
+       tracked by the database, they do not have to be recalculated at startup
+       or following reconfiguration. This may result in less processing overhead
+       during these events. The new statistics will be accessible via a new Hooks
+       library, being developed for Kea 1.4 under #5589. 
+       (Trac #5586, git a070c327668c10de3b28f5e249f91d6d16a97ff5)
+
 1394.  [doc]           marcin
        Documented High Availability hook library in the Kea
        Administrator Reference Manual.