adapter: Reset pending settings when receiving MGMT error

adapter: Reset pending settings when receiving MGMT error

We set the pending settings flag when sending MGMT_SETTING_*
commands to the MGMT layer and clear them when receiving a
successful reply, but we don't clear them when receiving an error
reply. This might cause a setting to be stuck in pending state.

Therefore, also clear the pending flag when receiving error.
Furthermore, this patch also postpones setting the pending flag
until we queue the MGMT command in order to avoid setting it too
soon but we return early.

This was caught during power off test, where MGMT_OP_SET_POWERED
returns Authentication Failed because disconnection takes too long.
Future attempts to switch power will then be ignored.

< HCI Command: Disconnect (0x01|0x0006) plen 3   #17916 [hci0] 12.502908
        Handle: 512
        Reason: Remote Device Terminated due to Power Off (0x15)
> HCI Event: Command Status (0x0f) plen 4        #17917 [hci0] 12.503185
      Disconnect (0x01|0x0006) ncmd 1
        Status: Success (0x00)
@ MGMT Event: Command Status (0x0002) plen 3   {0x0001} [hci0] 14.519491
      Set Powered (0x0005)
        Status: Authentication Failed (0x05)
= bluetoothd: Failed to set mode: Authentication Failed (0x05) 14.520042
= bluetoothd: adapter /org/bluez/hci0 set power to 0           14.813533
> HCI Event: Disconnect Complete (0x05) plen 4   #17918 [hci0] 16.509043
        Status: Success (0x00)
        Handle: 512
        Reason: Connection Timeout (0x08)

Reviewed-by: Sonny Sasaka <sonnysasaka@chromium.org>
Signed-off-by: Manika Shrivastava <manika.sh@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>