Description of the issue: When Initiator receives aux_scan_rsp with unknown address, instead of sending "last command done" and let the stack decide if it's a valid address, it ignore the packet and keep scanning. The peripheral act as the connection is established. 

Steps to reproduce the issue:

1. Set the initiator Resolvable Private Address Timeout to 5 seconds or less.
2. Set Create connection command with privacy.
3. The peripheral will advertise but with wrong IRK.
4. The connection should not be established.
5. Wait at least 5 seconds.
6. The peripheral will now advertise with correct IRK
7. The connection now should be established but will fail.