scripts: call readlink in CT context in systemd-autofs-restart.sh

Now readlink is called in host context, this is obviously wrong.
Signed-off-by: Eugene Kolomeetz <klm@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

scripts/systemd-autofs-restart.sh

@@ -37,7 +37,7 @@ fi
 JOIN_CT="$NS_ENTER -t $CRTOOLS_INIT_PID -m -u -p"
 
 # Skip container, if it's not systemd based
-[ "$($JOIN_CT basename -- $(readlink /proc/1/exe))" == "systemd" ] || exit 0
+[ "$($JOIN_CT basename -- $($JOIN_CT readlink /proc/1/exe))" == "systemd" ] || exit 0
 
 AUTOFS_SERVICES="proc-sys-fs-binfmt_misc.automount"