Fix TPM 1.2 migration (#195)
* Fix issue with TPM 1.2 migration auth (#1)
Fix some TPM 1.2-specific issues related to key migration and testing:
- A bug in CreateWrapKey that uses an incorrect key to encrypt a key's `migrationAuth` value
- Addition of `AuthorizeMigrationKey` and `CreateMigrationBlob` command functions to enable testing of migration auth bug fix
- A bug fix in TakeOwnership that prevented successful authorization of the command
- A session leak in a couple of TPM 1.2 tests (`TestOIAP` and `TestOSAP`)
- Improvements to the TPM 1.2 tests to allow execution on a TPM that needs to be started up
- Initial effort at documentation for running the TPM 1.2 tests against the IBM simulator
* Delete extraneous file
