copy_puppet_logs.sh: copy horizon config when possible
copy_puppet_logs.sh: copy horizon config when possible

If /etc/openstack-dashboard is present, copy the Horizon config file(s)
in LOG_DIR/etc/openstack-dashboard and make sure they can be read by the
browser (txt files).

Change-Id: I55e8aac6a066820d3e24967ac68bc46ab95e67b6

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