Ensure 'libffi-devel' is installed so that python-cffi can build
Ensure 'libffi-devel' is installed so that python-cffi can build

Closes-Bug: #1482323

Change-Id: Ief2944491ecc67a229ffea8ee24e72a629adfe79

coolsvap/project-config,dongwenjuan/project-config,dongwenjuan/project-config,Tesora/tesora-project-config,coolsvap/project-config,noorul/os-project-config,Tesora/tesora-project-config,openstack-infra/project-config,noorul/os-project-config,openstack-infra/project-config