Set different cloud name for alt_demu user
Set different cloud name for alt_demu user

Having multiple clouds with the same name in clouds.yaml confuses
openstack client config and it may not choose the intended cloud.
Unfortunately the new alt_demo user's clouds.yaml config used a
duplicate name creating confusion for clouds.yaml consumers.

Correct this by using a unique cloud name, devstack-alt, for use by the
alt_demo user.

Change-Id: I2cb8f10ab5abfedf76ead309f237730ce8ce2ad4

dtroyer/devstack,samgoon/devstack,dirkmueller/devstack,richliu/devstack,nawawi/openstack,nawawi/openstack,group-policy/devstack,openstack-dev/devstack,group-policy/devstack,richliu/devstack,bswartz/devstack,bigswitch/devstack,bswartz/devstack,samgoon/devstack,noironetworks/devstack,noironetworks/devstack,bigswitch/devstack,openstack-dev/devstack,dtroyer/devstack,Mahito/devstack,dirkmueller/devstack,Mahito/devstack