testing: Update base image to Debian jessie

Several packages got renamed/updated, libgcrypt was apparently installed
by default previously.

Since most libraries changed we have to completely rebuild all the tools
installed in the root image.  We currently don't provide a clean target in
the recipes, and even if we did we'd have to track which base image we
last built for.  It's easier to just use a different build directory for
each base image, at the cost of some additional disk space (if not manually
cleaned).  However, that's also the case when updating kernel or
software versions.

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