Create a KeystoreClient class.

KeystoreClient is designed to give native brillo services convenient
access to keystore services. This CL also includes a command line tool
that uses the KeystoreClient interface. This was used for testing but
can also be enhanced to be generally useful.

BUG: 23528174
TEST=manual tests using keystore_cli_v2

Change-Id: I6266d98cfc7c4936f803a8133020c032bc519a5b
6 files changed
tree: c46a81a11bd45bfc4018811f2b310e7776d667be
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/