ws: Don't rely on Fedora specific make-dummy-cert script
ws: Don't rely on Fedora specific make-dummy-cert script

The script was non-portable, not-flexible, and caused problems
with SELinux.

Fixes #205
Closes #655
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

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