Fix some custom groups

* lisp/vc/vc-hooks.el (vc-faces): Rename from vc-state-faces.
* lisp/vc/cvs-status.el (cvs-status): Unused, remove.

lisp/eshell/em-tramp.el

@@ -32,6 +32,8 @@
   (require 'eshell)
   (require 'tramp))
 
+;; There are no items in this custom group, but eshell modules (ab)use
+;; custom groups.
 ;;;###autoload
 (progn
  (defgroup eshell-tramp nil

lisp/eshell/em-xtra.el

@@ -29,6 +29,8 @@
   (require 'pcomplete))
 (require 'compile)
 
+;; There are no items in this custom group, but eshell modules (ab)use
+;; custom groups.
 ;;;###autoload
 (progn
 (defgroup eshell-xtra nil

lisp/vc/cvs-status.el

@@ -33,11 +33,6 @@
 
 ;;;
 
-(defgroup cvs-status nil
-  "Major mode for browsing `cvs status' output."
-  :group 'pcl-cvs
-  :prefix "cvs-status-")
-
 (easy-mmode-defmap cvs-status-mode-map
   '(("n"	. next-line)
     ("p"	. previous-line)

lisp/vc/vc-hooks.el

@@ -34,9 +34,9 @@
 
 ;; Faces
 
-(defgroup vc-state-faces nil
+(defgroup vc-faces nil
   "Faces used in the mode line by the VC state indicator."
-  :group 'vc-faces
+  :group 'vc
   :group 'mode-line
   :version "25.1")