Turn off bindep

bindep installs a slew of stuff we don't really need and doesn't add
much if any value.  This only turns on bindeps that are required.

This shaves about 3 minutes off each gate run.

Closes-Bug: #1620865
Change-Id: I24df4f2a30c682c1b09e89c7c52f7608582da1a6

bindep.txt

+libffi-dev [platform:dpkg]
+libffi-devel [platform:rpm]