testing: Make TKM related build recipes future-proof

The tkm scenarios recently failed due to a segmentation fault on my host
because I had an old build of the tkm library already built in the build
directory.  Because the stamp file was not versioned the new release was
never checked out or built and charon-tkm was linked against the old
version causing a segmentation fault during key derivation.
testing: Make TNC scenarios agnostic to the actual Debian version

The scenarios will work with new or old base images as long as the version
in use is included as product in the master data (src/libimcv/imv/data.sql).
testing: Don't check for the actual number of SWID tags in PDP scenarios

The number of SWID tags varies depending on the base image, but lets
assume the number is in the hundreds.