linux-container: Remove '%containerized-shepherd-service' hack.

This hack worked around a defect in the Shepherd 0.5.0 and is no longer
needed.

* gnu/services/shepherd.scm (%containerized-shepherd-service): Remove.
* gnu/system/linux-container.scm (container-essential-services): Don't
use it.

gnu/services/shepherd.scm

@@ -60,7 +60,6 @@
             %default-modules
 
             shepherd-service-file
-            %containerized-shepherd-service
 
             shepherd-service-lookup-procedure
             shepherd-service-back-edges
@@ -346,21 +345,6 @@ symbols provided/required by a service."
   (lambda (service)
     (vhash-foldq* cons '() service edges)))
 
-(define %containerized-shepherd-service
-  ;; XXX: This service works around a bug in the Shepherd 0.5.0: shepherd
-  ;; calls reboot(2) (via 'disable-reboot-on-ctrl-alt-del') when it starts,
-  ;; but in a container that fails with EINVAL.  This was fixed in Shepherd
-  ;; commit 92e806bac1abaeeaf5d60f0ab50d1ae85ba6a62f.
-  (simple-service 'containerized-shepherd
-                  shepherd-root-service-type
-                  (list (shepherd-service
-                         (provision '(containerized-shepherd))
-                         (start #~(lambda ()
-                                    (set! (@@ (shepherd)
-                                              disable-reboot-on-ctrl-alt-del)
-                                      (const #t))
-                                    #t))))))
-
 (define (shepherd-service-upgrade live target)
   "Return two values: the subset of LIVE (a list of <live-service>) that needs
 to be unloaded, and the subset of TARGET (a list of <shepherd-service>) that

gnu/system/linux-container.scm

@@ -29,7 +29,6 @@
   #:use-module (gnu build linux-container)
   #:use-module (gnu services)
   #:use-module (gnu services base)
-  #:use-module (gnu services shepherd)
   #:use-module (gnu system)
   #:use-module (gnu system file-systems)
   #:export (system-container
@@ -52,7 +51,7 @@ from OS that are needed on the bare metal and not in a container."
                  (let ((locale (operating-system-locale-directory os)))
                    (with-monad %store-monad
                      (return `(("locale" ,locale))))))
-        (append base (list %containerized-shepherd-service))))
+        base))
 
 (define (containerized-operating-system os mappings)
   "Return an operating system based on OS for use in a Linux container