qemuxmlconftest: Add '+amdsev' versions of the rest of 'launch-security-sev*' cases

qemuxmlconftest: Add '+amdsev' versions of the rest of 'launch-security-sev*' cases

While the 'launch-security-sev-direct' and 'launch-security-sev-snp'
cases use "latest" caps, they use the non-sev variant and add-in the
relevant capabilities.

To do the test properly we can add '+amdsev' variant which uses caps
fetched from a real host that does support all the capabilities.

The output files are identical, although they are not added as symlinks
to prevent headaches if they do diverge at some point.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>