[master] Added ChangeLog entry 721 for trac3207.

ChangeLog

@@ -1,3 +1,9 @@
+721.	[func]      tmark
+	Updates the user_chk example hooks shared library with callouts for packet 
+	receive and packet send.  Decision outcome now includes the lease or prefix
+	assigned.  The user registry now supports a default user entry. 
+	(Trac #3207, git 34fddf2e75b80d9e517a8f9c3321aa4878cda795)
+
 720.	[func]		tmark
 	Added the initial implementation of the class, NameAddTransaction,
 	to b10-dhcp-ddns.  This class provides a state machine which implements