* This code change will add in the delta certficates to the platform validation check. The current base passes the policy check as long as the base is valid. The deltas are ignored. This is because the validation pulls in what is associated with a particular EK associated with the machine provisioning.
* This code adds functionality to check the delta certificates in a chain. The main operation validates that the delta belongs in that chain and then that the chain establishes correct component modification. No removes before an add, no add to a component that exists, no remove to a component that doesn't exist. The unit test was updated to not use any flat file certificate.
Closes#109
* Changes were made to the validation of a delta certificate based on newer information. There can be multiple bases and multiple leaves in a tree of associated certificates. However currently we don't have certificates to validate the entirety of the code to test.
* Updated the code to treat the platform attributes policy, if v2, against all in the chain rather than one at a time.
* Added methods and placeholders for checking the supply chain for base and delta credentials according to the new TCG spec
Checkstyle changes
Created a new SupplyChainValidation.ValidationType for delta credential attributes. The existing PLATFORM_CREDENTIAL
ValidationType will be used for both base and delta platform credentials from spec 1.1.
* Checkstyle error: trailing spaces
Added an additional null check for a platform supply validation. Added a mapping object for platform credential to the associated attributes during validations.
Added an additional null check for a platform supply validation. Added a mapping object for platform credential to the associated attributes during validations. Missed import statement.
