cros_generate_update_payload: Stop computing md5 hashes of the root and kern.

These values aren't used by anything, and they're buried in a bunch of other
output making it unlikely a person will even notice they're there. They take a
non-trivial amount of time to compute, so lets get rid of them.

real    7m42.613s
user    5m4.315s
sys     0m23.483s

BUG=chromium:422665
TEST=Ran paygen_payload.

Change-Id: Ie267a5048893ad3a4ee507067bef8e83e68ac8a9
Reviewed-on: https://chromium-review.googlesource.com/223129
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
diff --git a/host/cros_generate_update_payload b/host/cros_generate_update_payload
index f35b702..f65dafb 100755
--- a/host/cros_generate_update_payload
+++ b/host/cros_generate_update_payload
@@ -263,14 +263,10 @@
 if [[ "${DELTA}" -eq "${FLAGS_TRUE}" ]]; then
   if [[ "${FLAGS_full_kernel}" -eq "${FLAGS_FALSE}" ]]; then
     SRC_KERNEL=$(extract_kern "${SRC_DEV}" "${FLAGS_src_kern_path}")
-    echo md5sum of src kernel:
-    md5sum "${SRC_KERNEL}"
   else
     echo "Generating a full kernel update."
   fi
   SRC_ROOT=$(extract_root "${SRC_DEV}" "${FLAGS_src_root_path}")
-  echo md5sum of src root:
-  md5sum "${SRC_ROOT}"
 fi
 
 DST_KERNEL=$(extract_kern "${DST_DEV}" "${FLAGS_kern_path}")