Event processing when no access to vendor-table.json

[iadgovuser58]

When eventlog tool is run as user (such as in a command prompt without sudo, or in an IDE which is run as the user), the vendor-table.json file is not accessible, and so valid GUID lookups return "unknown GUID reference". In some cases the code needs this GUID reference to determine the next piece of code that executes. If the GUID is valid but the code thinks it is invalid, it will not process the next chunk of data properly.

Changes needed:

Part 1:

• do not process code with an unknown SignatureType in EFI_SIGNATURE_TYPE
• add output to indicate how many signature lists there are, and how many certs or hashes in each list

Part 2:

• when grabbing the file vendor-table.json from /etc/hirs/aca/default-properties/vendor-table.json, if the file is not accessible, then grab the file from code: /HIRS_AttestationCA/src/main/resources/vendor-table.json
• if the vendor-table.json is not accessible, print a msg noting this and warning that not all Secure Boot PCR 7 data will be processed
• if the vendor-table.json from code was used, print a msg noting that the file was not found, and the code file was used

Note for testing purposes:
Typical file permissions for the path to vendor

• /etc/ drwxr-xr-x.
• /hirs/ drwxr-xr-x
• /aca/ drwxr-x---
• /default-properties/ drwxr-xr-x
• vendor-table.json -rw-r--r--
  For testing purposes, to render the file vendor-table.json acessible to user, the permissions for /aca/ need to be changed from 750 to 751.