FAPI: Add logging for certificate verification.
FAPI: Add logging for certificate verification.

* If the downloaded intermediate certificate can't be converted do X509 format
  an error message with the blob of the downloaded certificate will be displayed.
* If display of debugging information is activated the EK certificate and the corresponding
  intermediate certificate will be displayed.

Signed-off-by: Juergen Repp <juergen.repp@sit.fraunhofer.de>

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01org/TPM2.0-TSS,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,01org/tpm2-tss,tpm2-software/tpm2-tss,01org/tpm2-tss,01org/TPM2.0-TSS,01org/tpm2-tss