Write clouds.yaml to /etc as well
Write clouds.yaml to /etc as well

There are more than one user that need to access clouds.yaml values
in tests. Rather than copying the file everywhere, simply output
it to /etc/openstack.

However, we have things copying it at the moment, so output to
both places. A follow up patch will remove the homedir version.

Change-Id: I21d3c2ad7a020a5ab02dc1ab532feae70b718892

prithivm/branch01,dtroyer/devstack,thomasem/devstack,varunarya10/devstack,nawawi/openstack,mssumanth/devstack,bigswitch/devstack,Mahito/devstack,dtroyer/devstack,openstack-dev/devstack,samgoon/devstack,thomasem/devstack,noironetworks/devstack,dirkmueller/devstack,bswartz/devstack,samgoon/devstack,group-policy/devstack,pombredanne/devstack,richliu/devstack,bswartz/devstack,group-policy/devstack,noironetworks/devstack,prithivm/branch01,avvocatodemarchis/devstack,richliu/devstack,nawawi/openstack,pombredanne/devstack,openstack-dev/devstack,Mahito/devstack,dirkmueller/devstack,mssumanth/devstack,varunarya10/devstack,bigswitch/devstack,avvocatodemarchis/devstack