Add keystone docker-compose file.
Add keystone docker-compose file.

To follow the model of container sets, net will be set to
host so that containers will not need to be linked together.

All enviroment variables will come from 'openstack.env'.

Co-authored-by: Ian Main <imain@redhat.com>

Change-Id: Ifdb0f146ff82c0fedb09255f6e1955ecdc435444

LoHChina/kolla,dardelean/kolla-ansible,jakedahn/kolla,limamauricio/mykolla,limamauricio/mykolla,mandre/kolla,jakedahn/kolla,rajalokan/kolla,intel-onp/kolla,HackToday/kolla,stackforge/kolla,limamauricio/mykolla,chenzhiwei/kolla,fdumpling/kolla,coolsvap/kolla,jakedahn/kolla,thetrav/kolla,bdastur/kolla,meticulo3366/kolla,openstack/kolla,HackToday/kolla,invenfantasy/kolla,chenzhiwei/kolla,nihilifer/kolla,fdumpling/kolla,GalenMa/kolla,GalenMa/kolla,nihilifer/kolla,mrangana/kolla,invenfantasy/kolla,chenzhiwei/kolla,toby82/kolla,negronjl/kolla,thetrav/kolla,rahulunair/kolla,brk3/kolla,mandre/kolla,tonyli71/kolla,meticulo3366/kolla,negronjl/kolla,negronjl/kolla,LoHChina/kolla,LoHChina/kolla,coolsvap/kolla,fdumpling/kolla,rajalokan/kolla,openstack/kolla,brk3/kolla,rajalokan/kolla,stackforge/kolla,intel-onp/kolla,tonyli71/kolla,coolsvap/kolla,mrangana/kolla,toby82/kolla,dardelean/kolla-ansible,bdastur/kolla,toby82/kolla,invenfantasy/kolla,mandre/kolla,rahulunair/kolla,dardelean/kolla-ansible,stackforge/kolla,HackToday/kolla