Fix Tramp customization

Do not use the ;;;###tramp-autoload cookie for defcustoms.  This
damages the customisation when Tramp is autoloaded.  Reported by
Joel Reicher <joel.reicher@gmail.com>.

* lisp/net/tramp-cache.el (tramp-verbose): Declare.
(tramp-connection-properties):
* lisp/net/tramp-message.el (tramp-verbose):
Remove ;;;###tramp-autoload cookie.

lisp/net/tramp-cache.el

@@ -90,6 +90,7 @@
 (require 'time-stamp)
 
 (declare-function tramp-get-method-parameter "tramp")
+(defvar tramp-verbose)
 
 ;;; -- Cache --
 
@@ -97,7 +98,6 @@
 (defvar tramp-cache-data (make-hash-table :test #'equal)
   "Hash table for remote files properties.")
 
-;;;###tramp-autoload
 (defcustom tramp-connection-properties nil
   "List of static connection properties.
 Every entry has the form (REGEXP PROPERTY VALUE).  The regexp

lisp/net/tramp-message.el

@@ -56,7 +56,6 @@
 (defvar tramp-repository-branch)
 (defvar tramp-repository-version)
 
-;;;###tramp-autoload
 (defcustom tramp-verbose 3
   "Verbosity level for Tramp messages.
 Any level x includes messages for all levels 1 .. x-1.  The levels are