[v5.1] pkg/rootless: set _CONTAINERS_USERNS_CONFIGURED

... correctly

I tried to cherry pick 7c5c60b from @Luap99, however the
git cherry-pick wasn't having it.  I've made the changes
"by hand" to set _CONTAINERS_USERNS_CONFIGURED from init
to done in pkg/rootless/rootless_linux.c

Signed-off-by: tomsweeneyredhat <tsweeney@redhat.com>

pkg/rootless/rootless_linux.c

@@ -880,7 +880,7 @@ reexec_userns_join (int pid_to_join, char *pause_pid_file_path)
         setenv ("LISTEN_FDNAMES", saved_systemd_listen_fdnames, true);
     }
 
-  setenv ("_CONTAINERS_USERNS_CONFIGURED", "init", 1);
+  setenv ("_CONTAINERS_USERNS_CONFIGURED", "done", 1);
   setenv ("_CONTAINERS_ROOTLESS_UID", uid, 1);
   setenv ("_CONTAINERS_ROOTLESS_GID", gid, 1);
 
@@ -1081,7 +1081,7 @@ reexec_in_user_namespace (int ready, char *pause_pid_file_path, char *file_to_re
         setenv ("LISTEN_FDNAMES", saved_systemd_listen_fdnames, true);
     }
 
-  setenv ("_CONTAINERS_USERNS_CONFIGURED", "init", 1);
+  setenv ("_CONTAINERS_USERNS_CONFIGURED", "done", 1);
   setenv ("_CONTAINERS_ROOTLESS_UID", uid, 1);
   setenv ("_CONTAINERS_ROOTLESS_GID", gid, 1);