Different bluetooth host has different behaviors, so it's better
to maintain a scan check mechanism of BLE Mesh itself.
Fixes an issue when only PB-GATT is enabled for node, which will
output a scan error log when the device is provisioned.
Using the ble mesh white list test functions, a node can choose to
only receive mesh messages from a specific node and relay the
messages for it. Messages from other nodes will be ignored.