Make some network connections warn unless they are encrypted

* mail/smtpmail.el (smtpmail-via-smtp): Warn unless encrypted and
we're sending a password.

* pop3.el (pop3-open-server): Warn unless encrypted.

* nnimap.el (nnimap-open-connection-1): Warn unless encrypted.

lisp/ChangeLog

 2014-11-23  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
+	* mail/smtpmail.el (smtpmail-via-smtp): Warn unless encrypted and
+	we're sending a password.
+
 	* net/nsm.el: New file that implements a Network Security Manager.
 
 	* net/network-stream.el (open-network-stream): Add a new

lisp/gnus/ChangeLog

+2014-11-23  Lars Magne Ingebrigtsen  <larsi@gnus.org>
+
+	* pop3.el (pop3-open-server): Warn unless encrypted.
+
+	* nnimap.el (nnimap-open-connection-1): Warn unless encrypted.
+
 2014-11-17  Albert Krewinkel  <albert@zeitkraut.de>
 
 	* message.el (message-valid-fqdn-regexp): Add non-internaional new

lisp/gnus/nnimap.el

@@ -405,6 +405,7 @@ textual parts.")
 	       "*nnimap*" (current-buffer) nnimap-address
 	       (nnimap-map-port (car ports))
 	       :type nnimap-stream
+	       :warn-unless-encrypted t
 	       :return-list t
 	       :shell-command nnimap-shell-program
 	       :capability-command "1 CAPABILITY\r\n"

lisp/gnus/pop3.el

@@ -561,6 +561,7 @@ Returns the process associated with the connection."
 		     'tls)
 		    (t
 		     (or pop3-stream-type 'network)))
+	     :warn-unless-encrypted t
 	     :capability-command "CAPA\r\n"
 	     :end-of-command "^\\(-ERR\\|+OK\\).*\n"
 	     :end-of-capability "^\\.\r?\n\\|^-ERR"

lisp/mail/smtpmail.el

@@ -687,6 +687,7 @@ Returns an error if the server cannot be contacted."
 		   "smtpmail" process-buffer host port
 		   :type smtpmail-stream-type
 		   :return-list t
+		   :warn-unless-encrypted ask-for-password
 		   :capability-command (format "EHLO %s\r\n" (smtpmail-fqdn))
 		   :end-of-command "^[0-9]+ .*\r\n"
 		   :success "^2.*\n"