jpkg to create the package for boot module

[Mandy Chung]

Dalibor,

I'm making changes in the modules build to generate jpkg packages.  The 
package for the boot module is currently not created using jpkg.   Can 
we make jpkg to generate the package for the boot module as well? 
Thus, jpkg will be the single place that interfaces with the native 
packaging tool (currently both makefile and jpkg call dpkg-deb).

This would be a special case and the difference would be that jmod won't 
exist until it is installed and also it doesn't need the Predepend rule. 
   Probably we could add an internal jpkg option for this special case. 
    What do you think?

BTW, I notice that the tmp directory that jpkg creates is not removed 
(the modules and the metadata directories were removed in the cleanup() 
method).   Since you're making changes in jpkg, I'll leave it for you to 
fix :)

Thanks
Mandy