fix: remove_bond request should be handled after disconnect

[kkkbird]

this PR is about to fix #363 case 1, this.request will reset to null in call of nextRequest(false) below and callback for removeBond won't be invoked correctly even though bond status change signal is received later. how ever it may introduce unintended side effects as noted in the comment above. Please help to review it.

Android-BLE-Library/ble/src/main/java/no/nordicsemi/android/ble/BleManagerHandler.java

Lines 2200 to 2212 in bfcfdf9

	if (r != null) {
	if (r.type != Request.Type.DISCONNECT && r.type != Request.Type.REMOVE_BOND) {
	// The CONNECT request is notified below.
	// The DISCONNECT request is notified below in
	// notifyDeviceDisconnected(BluetoothDevice).
	// The REMOVE_BOND request will be notified when the bond state changes
	// to BOND_NONE in the broadcast received on the top of this file.
	r.notifyFail(gatt.getDevice(),
	status == BluetoothGatt.GATT_SUCCESS ?
	FailCallback.REASON_DEVICE_DISCONNECTED : status);
	request = null;
	}
	}