bug#24432: 25.1; tramp-cleanup-connection is not removing connection from completion list.

[Thierry Volpiatto]

To reproduce:
C-x C-f /sudo:: RET
M-x tramp-cleanup-connection
Choose connection and RET

The connection is closed (process deleted and buffers killed) but the
connection is not removed from tramp-cache-data so when doing again
M-x tramp-cleanup-connection the item still remaining in completion.

The reason is that tramp try to remove 
["sudo" "root" "localhost" "" nil] from hash-table
whereas the key in hash-table is
["sudo" "root" "localhost" nil nil]
This is due to tramp-dissect-file-name that returns
["sudo" "root" "localhost" "" nil] instead of
["sudo" "root" "localhost" nil nil]



In GNU Emacs 25.1.3 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2016-09-08 built on dell-14z
Repository revision: 139289426d1b2c90335cec86c5ac19c51bf08bfc
Windowing system distributor 'The X.Org Foundation', version 11.0.11701000
System Description:     Linux Mint 17.3 Rosa

Configured using:
 'configure CFLAGS=-O3'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: fr_FR.UTF-8
  value of $LC_NUMERIC: fr_FR.UTF-8
  value of $LC_TIME: fr_FR.UTF-8
  value of $LANG: fr_FR.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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  file-name-shadow-mode: t
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  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Setting up indent for shell type sh
Indentation variables are now local.
Indentation setup for shell type sh
Restoring buffers...done
Decrypting /home/thierry/.authinfo.gpg...done
Mark set
Quit
delete-backward-char: Text is read-only
Saved to kill-ring: tramp-cleanup-connection
Quit

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cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
dbusbind inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 621410 145601)
 (symbols 48 58359 8)
 (miscs 40 378 1903)
 (strings 32 151915 129503)
 (string-bytes 1 4775594)
 (vectors 16 82527)
 (vector-slots 8 1218618 72842)
 (floats 8 2705 1206)
 (intervals 56 1941 1329)
 (buffers 976 111)
 (heap 1024 65327 35174))

-- 
Thierry