Merge changes I693b0596,Ib5a05c47,I1da213fd,I32cd6412,If62f334d, ... into nyc-dev

* changes:
  PTS: Read SMP pairing options from bt_stack.conf
  PTS: Avoid BR SDP after LE pairing
  PTS: Allow disabling connection updates
  PTS: Add a Secure Only mode.
  Changes to allow LE key upgrade
  Allow C++ code to check bt_stack_config options