Extensive and thoughtful modifications to vendor_module_check

Change-Id: Ifa25c0d9bb04de5d82ca33d5d94b78adeaed42c7
remove --block from build. Makes it impossible to edit .zip files before or
after flashing...

Change-Id: Icb77ddd42610d60fe1455fafbba107bff064685b
optipng -nc -nb -o7

Change-Id: I8a5ea2f89b7b65ace87dfd13eb95f97aa6f5cf77
forall_vanir: use repo forall environment, rather than sed slapchopping lines of the manifest

Change-Id: Iea71fd133f4fc04cf5a55ff0e9beb4274ad250bf
forall_vanir: prevent  partial matches

Change-Id: Ifb26f8427af7d41b65b751a56a2d105609d7d0c9
forall_vanir: one-liner-fy

Change-Id: I5357fb831b1c2b8d7f9be7fde10d439bd0e9382c
Merge "remove --block from build. Makes it impossible to edit .zip files before or after flashing..." into L5