Support Attestation Generation and Verification

Breaking Changes

• #97 - Rename tpm2tools package to client, to better contrast with the existing server package
• #90 - Rename methods containing AIK (a TPM 1.2 term) to AK (the corresponding TPM 2.0 term)
• #104 - Update minimum Go version to 1.16
• #117 #133 - Changed sealing/unsealing options:
  • SealOpt interface is now a client.SealOpts structure
  • CertifyOpt interface is now a client.UnsealOpts structure

New features

• #53 - Add client.Quote and internal.VerifyQuote
• #100 - Add client.GetEventLog and server.ParseMachineState
• #105 - Add client.ReadAllPCRs and use it in gotpm read pcr
• #106 - Add client.Attest
• #108 - Add GCE-specific methods: client.GceAttestationKeyECC and client.GceAttestationKeyRSA
• #103 - Add server.VerifyAttestation, server.EvaluatePolicy, and server.ParseMachineState

Bug fixes

• #123 - Use /dev/tpmrm0 by default
• #106 - Have simulator.Get block instead of failing