Add futures to requirements
Add futures to requirements

Add futures to requirements since we need them for 69135 and 63904.

Change-Id: I5f032468c751256bf64abc31ebe0ad1cd26fd2c8

faizan-barmawer/ironic-lib,openstack/ironic-lib,citrix-openstack-build/ironic-lib,faizan-barmawer/elytics,NaohiroTamura/ironic-lib