Bluetooth: Fix disconnecting connections in non-connected states

When powering off and disconnecting devices we should also consider
connections which have not yet reached the BT_CONNECTED state. They may
not have a valid handle yet and simply sending a HCI_Disconnect will not
work.

This patch updates the code to either disconnect, cancel connection
creation or reject incoming connection creation based on the current
conn->state value as well as the link type in question.

When the power off procedure results in canceling connection attempts
instead of disconnecting connections we get a connection failed event
instead of a disconnection event. Therefore, we also need to have extra
code in the mgmt_connect_failed function to check if we should proceed
with the power off or not.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

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