Bring back LX zones.

*** 2189,2200 ****
                  }
  
                  /*
                   * In failsafe mode, we don't use login(1), so don't try
                   * setting up a utmpx entry.
                   */
!                 if (!failsafe)
                          if (setup_utmpx(slaveshortname) == -1)
                                  return (1);
  
                  /*
                   * The child needs to run as root to
--- 2189,2210 ----
                  }
  
                  /*
                   * In failsafe mode, we don't use login(1), so don't try
                   * setting up a utmpx entry.
+                  *
+                  * A branded zone may have very different utmpx semantics.
+                  * At the moment, we only have two brand types:
+                  * Solaris-like (native, sn1) and Linux.  In the Solaris
+                  * case, we know exactly how to do the necessary utmpx
+                  * setup.  Fortunately for us, the Linux /bin/login is
+                  * prepared to deal with a non-initialized utmpx entry, so
+                  * we can simply skip it.  If future brands don't fall into
+                  * either category, we'll have to add a per-brand utmpx
+                  * setup hook.
                   */
!                 if (!failsafe && (strcmp(zonebrand, "lx") != 0))
                          if (setup_utmpx(slaveshortname) == -1)
                                  return (1);
  
                  /*
                   * The child needs to run as root to