[PATCH] Additions to pyblock for storage rewrite

[Joel Granados Moreno <jgranado redhat com>]

Hello list.

The commit comment pretty much says what I am doing.  In my storage
rewrite I hit a segmentation fault comming from
set.activate(mknod=True). 

Any comments are greatly appreciated.

Regards.

Joel Andres Granados
Brno, Czech Republic, Red Hat.