Changes to auditd_core policy

- remove @load for auditd_policy.

- Add identity and Info types back into the core since there were data
struc issues when these types were defined in the until policy.

- Add action and identity tables.

- To address interplay between core and policy, introduce a delay in
table entry deletion.

- Add delete_item event to support delayed deletion.

- Index split cleanup.

- remove AUDITD_POLICY::AUDITD_POLICY_LOAD logic.