packaging: setup: Making separate WSP CSR available also in temp file

Making CSR for a WebsocketProxy on a sperate host available
also in a temp file.
Fixing name and file permission of default cert.

Change-Id: If517c577ead43e604442c7d468f034c2c8eaf276
Bug-Url: https://bugzilla.redhat.com/1115993
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>