specs: Move git repository URLs into spec files

This removes the @SOURCE@ substitution.

Signed-off-by: Euan Harris <euan.harris@citrix.com>
specs: Remove the @PREFIX@ substitution

Instead of rewriting the %setup directive in the spec file, we either
create a source tarball that adheres to RPM's conventions, creating a
directory called %{name}-%{version} when unpackeed, or we override the
name using the '-n' flag in the %setup directive.

Signed-off-by: Euan Harris <euan.harris@citrix.com>
specs: Remove conf.json

Signed-off-by: Euan Harris <euan.harris@citrix.com>