Keystore 2.0: Remove Keystore 1.0 and remaining references

* Remove superseded keystore engine backends.
* Remove keystore_cli.
* Update keystoer_cli_v2 to use Keystore 2.0.
* Update confirmationui invocation test.
* Remove reference to enable keystore2 property from keystore2.rc.

Test: N/A
Bug: 171305684

Change-Id: I855dead9d95c2c8cfa451944087bc8290871c0e5
68 files changed