Adding missing system dependencies to quickstart

libffi-dev(el) recently became a system dependency and is not
documented in the quickstart guide.

Closes-bug: #1298587
Change-Id: I6722f9c600335213408f53b81d4a2915a0dc3bf5
Updated from global requirements

Change-Id: I456a0cba747d14a2c3b6d11a15ea9b8a40cd80eb
Merge "Updated from global requirements"
Merge "Adding missing system dependencies to quickstart"