Reduce over-severe logging

Reduce the number of error logs that are emitted by Keystore on a normal
start-up:

- StrongBox is optional, so if its hardware type is unavailable, don't
  treat that as an error.
- Helper text for `deleteAllKeys`.
- Swap "unexpected" for domain info.
- Also remove unnecessary `pub` instances.

Test: boot Cuttlefish, watch logcat
Change-Id: I7c2a7a3ad05a5afedf2b3f3cdba1136a38183183
diff --git a/keystore2/src/audit_log.rs b/keystore2/src/audit_log.rs
index 8d9735e..4952b3b 100644
--- a/keystore2/src/audit_log.rs
+++ b/keystore2/src/audit_log.rs
@@ -34,8 +34,8 @@
     match domain {
         Domain::APP => uid,
         Domain::SELINUX => (nspace | FLAG_NAMESPACE) as i32,
-        _ => {
-            log::info!("Not logging audit event for key with unexpected domain");
+        d => {
+            log::info!("Not logging audit event for key with domain {d:?}");
             0
         }
     }