Make sure to install apt-transport-https
Make sure to install apt-transport-https

This patch makes sure that apt-transport-https is installed, and
avoids failure in gate job now running with ubuntu-trusty.

Change-Id: Iaf578990cfd80d9565d6de8fb0d7ee8258175720

openstack/storlets,openstack/storlets,openstack/storlets,openstack/storlets