This change adds the option 'activation scripts' to the patch recipe,
allowing the user to add one or multiples scripts that will be copied to
the patch and added to the metadata.
Test plan:
PASS - Create patch with one activation script, check if file is on
patch and check value in the patch's metadata.
PASS - Create patch with multiple activation scripts, check if files
are inside the patch and check values in the patch's metadata.
PASS - Create patch without any activation script, check if files
are inside the patch and check if value in the patch's metadata.
PASS - Check if patch-builder fails when patch recipe doesn't have
activate script element.
Story: 2010676
Task: 51239
Change-Id: I7073f59dfd7eefa0986a39fd70d4207bb437c9ba
Signed-off-by: Dostoievski Batista <dostoievski.albinobatista@windriver.com>