Additional test cases to CtsVerifier CredentialManagementApp

* Check credential management app can generate
  a key pair, install a certificate and successfully
  predefine which alias should be used to authenticate
  the user to a remote service.
* Check the chosen alias can be used to get the
  private key to sign data and the public key to
  validate the signature.

Bug: 178174704
Test: CtsVerifier - Credential management app test
Change-Id: Iabf9cc56e220e7a200b249a9282b4a233cfcd09c
2 files changed