test: Install systemtap-runtime-virtguest into our images
test: Install systemtap-runtime-virtguest into our images

This makes it easier (though not trivial, yet) to use systemtap
against a running test.

Closes #1164
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

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