Adding scan function before DUT connected

The expected connection time(10 seconds) is too short if we want to wait DUT scan automatically and connect to network.
You can add start_wifi_connection_scan_and_return_status before wait_for_connect before connected to trigger scan manually.

Bug: 134550860
Test: Local test 30 cycles passed

Change-Id: I37998ce444b775b936c7ffb8998cb94b7e6cf065