Add crypto key store partitioning tests

Add tests that run against standalone service instances to verify that
access to keys is partitioned by client ID. This checks that one client
cannot access another's keys and that each client has its own key ID
space.

Signed-off-by: Balint Dobszay <balint.dobszay@arm.com>
Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: Icd9a231f9becaedf825e57bbb183bb6a7be157d4
3 files changed