Rename problematic entries.

Zip entries with extensions such as .jar could cause the zip file to be
rejected as an attachment by some email providers. To circunvent such
issue, they will renamed with a '.renamed' suffix.

BUG: 28610953
BUG: 29395357
Change-Id: I9718821a53fdf0ce4f00ed360eddbf7fb4ca1cd6