releasetools: Don't assert an included bootloader

If we are including a bootloader with the update, do not require it
for the OTA since it will be updated with the package.

Change-Id: I074f132925974b1164185294ecfd35e37c6c3972
hammerhead: Use CM default overlays

- config_defaultNotificationLedOff
- def_screen_off_timeout

Change-Id: I07f11cf3f8fb4cdefb71d5a10b1b1b8ed88d7aca
Signed-off-by: Lorenzo M <djmesias@yahoo.es>
Update extract-files for updated apk entries

* a7ebbbb218ddb9a0102dc46eb1155e0c318f46fe
  'hammerhead: Update makefile generation script'
  added a hyphen in front of the apk entries but
  extract-files.sh was not updated to deal with that,
  breaking the script.
* Make it remove the leading hyphen as well.

Change-Id: I3be3096ca69aeca8303095e88d2a4f2a708fe782