execute kdump_post after do_default_action

User complains that kdump_post script doesn't execute after mount
failed. This happened since mount failure will trigger
kdump-error-handler.service, and then start kdump-error-handler.sh.
However in kdump-error-handler.sh it doesn't execute kdump_post.
Hence add it in this patch.

Surely the function do_kdump_post need be moved into kdump-lib-initramfs.sh
to be a common function.

v1->v2:
    Add a return value to do_kdump_post when invoked in kdump_error-handler.sh.
    And call do_kdump_post earlier than do_default_action, otherwise
    it may not execute if reboot/poweroff/halt.

Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Acked-by: Meifei Huang <mhuang@redhat.com>

dracut-kdump-error-handler.sh

@@ -6,5 +6,6 @@ set -o pipefail
 export PATH=$PATH:$KDUMP_SCRIPT_DIR
 
 get_kdump_confs
+do_kdump_post 1
 do_default_action
 do_final_action

dracut-kdump.sh

@@ -35,13 +35,6 @@ do_kdump_pre()
     fi
 }
 
-do_kdump_post()
-{
-    if [ -n "$KDUMP_POST" ]; then
-        "$KDUMP_POST" "$1"
-    fi
-}
-
 add_dump_code()
 {
     DUMP_INSTRUCTION=$1

kdump-lib-initramfs.sh

@@ -161,3 +161,10 @@ do_final_action()
 {
     eval $FINAL_ACTION
 }
+
+do_kdump_post()
+{
+    if [ -n "$KDUMP_POST" ]; then
+        "$KDUMP_POST" "$1"
+    fi
+}