Add upper-constraints generation glue
Add upper-constraints generation glue

propose-update needs to know how to generate upper-constraints for
requirements.

Change-Id: I6d9a6aaeab62a38d2eb38fcec6a585703023c60e

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