System need libffi-dev

The system need libffi-devel to allow pip to install all dependencies on
RedHat systems.

Additionally, a requirement is required for development packages to be
installed before creating the virtual env.

Change-Id: I8597b4438f0ce9830a63337a4a8073765eb9615a
Closes-Bug: 1286167
(cherry picked from commit 62598ca7ee8a223ee9e68b10f43b0095503276b4)