[master] Finished merge of trac5282 (client https)

ChangeLog

+1299.	[doc]		fdupont, tmark
+	Added an example stunnel configuration file to demonstrate
+	using kea-shell through https.
+	(Trac #5282, git xxx)
+
 1298.	[func]		marcin, tomek
 	DHCPv4 server supports shared networks. It allows for grouping
 	multiple subnets and use them interchangeably to allocate