tools: Use same cockpit.spec as Fedora for our testing

This makes our work easier trying to keep track of what's going
on and where. Use rpm condititionals to build optional parts
of the cockpit.spec file.

Simplify the make-rpms and make-srpms

Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>
tools: If JSL is not available allow build to proceed without it

Closes #1432
Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>