[bt][hci] Use correct local address when connecting

The locally initiated LE connection procedure now obtains the local
address type from the LE address manager. When privacy is enabled, the
bt-host now creates connections using a RPA.

This also fixes an issue with RemoteDevice expiration during a long
running connection attempt by marking the peer as non-temporary during
the initialization. This issue was surfaced by an integration test in the
GAP_AdapterTest tests that exercises the RPA timeout with a hanging
connection request.

BT-739 #done
Test: 1. bt-host-unittests, bt-integration-tests
      2. Pair with a LE keyboard while privacy is enabled.
         Reconnection after a disconnect should succeed.
	 Confirm that a random address was used to initiate
	 the connection by looking at the snoop logs.

Change-Id: I76e131dabc18a39aa684b9e87b02eb19ddf69cb6