depends on dracut selinux module

depends on 98selinux if 1st kernel selinux is enabled so we can load_policy
and correctly label the vmcore/vmcore-dmesg files.

Since dracut always mount rootfs, the 98selinux will chroot and load_policy,
so this will be ok for Fedora. In case rootfs mount failure we have to check
and relable vmcore files, will add the kdumpctl relabeling code in another
patch.

add 'dracut_args --printsize' to /etc/kdump.conf, it shows below added size:
selinux install size: 16k

Tested on F19:
With this patch applied, vmcore selinux attr is ok.

v1->v2: use sestatus 2>/dev/null to mute error messages

Signed-off-by: Dave Young <dyoung@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>

dracut-module-setup.sh

@@ -13,7 +13,12 @@ check() {
 }
 
 depends() {
-    echo "base shutdown"
+    local _dep="base shutdown"
+
+    if sestatus 2>/dev/null | grep -q "SELinux status.*enabled"; then
+        _dep="$_dep selinux"
+    fi
+    echo $_dep
     return 0
 }