mkuserimg: Dump lsof in case of a image generation failure.

This is a temporary change required to look at the list of all
open files in case of a image generation failure job.

Change-Id: I33479bf159a54302b360f8825969753b28739c35
diff --git a/ext4_utils/mkuserimg.sh b/ext4_utils/mkuserimg.sh
index 01be7be..be69738 100755
--- a/ext4_utils/mkuserimg.sh
+++ b/ext4_utils/mkuserimg.sh
@@ -87,6 +87,8 @@
 if [ $? -ne 0 ]; then
   echo "Ext image generation failed 1st time"
   ps aux
+  lsof
+  ls -Rl $SRC_DIR
   echo "Image generation retry. 2nd time"
   sleep 1m
   echo $MAKE_EXT4FS_CMD