Instance_id: Log only the first 8 bytes

instance-id of a VM is somewhat private to the app owning the VM, do not
log it in full

Test: Builds
Bug: 331349693
Change-Id: I2306efb95ecec13153e2e9a0c5c8600f21fa02c2
diff --git a/virtualizationservice/src/aidl.rs b/virtualizationservice/src/aidl.rs
index 833c535..f69cad4 100644
--- a/virtualizationservice/src/aidl.rs
+++ b/virtualizationservice/src/aidl.rs
@@ -459,7 +459,7 @@
             .context("Failed to allocate instance_id")
             .or_service_specific_exception(-1)?;
         let uid = get_calling_uid();
-        info!("Allocated a VM's instance_id: {:?}, for uid: {:?}", hex::encode(id), uid);
+        info!("Allocated a VM's instance_id: {:?}..., for uid: {:?}", &hex::encode(id)[..8], uid);
         let state = &mut *self.state.lock().unwrap();
         if let Some(sk_state) = &mut state.sk_state {
             let user_id = multiuser_get_user_id(uid);