90mdraid/mdraid-waitclean.sh: add rd.md.waitclean parameter

add rd.md.waitclean parameter, which defaults to 0
https://bugzilla.redhat.com/show_bug.cgi?id=759148

dracut.kernel.7.xml

@@ -357,6 +357,14 @@ This parameter can be specified multiple times.</para>
             <para>ignore mdadm.conf included in initramfs</para>
           </listitem>
         </varlistentry>
+        <varlistentry>
+          <term>
+            <envar>rd.md.waitclean</envar>=1
+          </term>
+          <listitem>
+            <para>wait for any resync, recovery, or reshape activity to finish before continuing</para>
+          </listitem>
+        </varlistentry>
         <varlistentry>
           <term>
             <envar>rd.md.uuid=<replaceable>&lt;md raid uuid&gt;</replaceable></envar>

modules.d/90mdraid/mdraid-waitclean.sh

@@ -2,8 +2,8 @@
 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
 # ex: ts=8 sw=4 sts=4 et filetype=sh
 
+if getargbool 0 rd.md.waitclean; then
     type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
-
     containers=""
     for md in /dev/md[0-9_]*; do
         [ -b "$md" ] || continue
@@ -23,3 +23,4 @@ for md in $containers; do
     done
 
     unset containers udevinfo
+fi