bug#27823: 26.0.50; nsm in paranoid mode always saves fingerprint in session-only mode

[Robert Pluim]

; This is with the HEAD of master
; Make sure that network-security.data doesn't contain the fingerprint
  for lists.gnu.org, which for me is 
sha1:e9248aef3ac9bcbba8d57fa471a07073adb88cbd

emacs -Q
(setq network-security-level 'paranoid)
M-x eww RET
https://lists.gnu.org RET
; Answer 'session only' to the prompt
C-x C-c
emacs -Q
(setq network-security-level 'paranoid)
M-x eww RET
https://lists.gnu.org RET

; Be very surprised that you're not reprompted to accept the
  certificate, and see that its fingerprint has been added to
  network-security.data

If I've said 'session only', I expect emacs to save nothing about the
connection at all.

Regards

Robert

In GNU Emacs 26.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2017-07-25 built on rpluim-ubuntu
Repository revision: 4e619aaa163f771c0ce271671c2b6fde09f8ba81
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:     KDE neon LTS User Edition 5.8