Download and inspect the attestation token

I get the following error when inspecting the downloaded example token

```
$ ./evcli cca print --token $HOME/cca_example_token.cbor
Error: loading CCA evidence from /home/tkoskela/cca_example_token.cbor: CBOR decoding of CCA evidence failed: cbor: wrong tag number for ccatoken.CBORCollection, got [907], expected [399]
```