Run WIFI-GET-RSSI and WIFI-CONNECT-DISCONNECT-REPEAT tests in secure mode
Remove WIFI-CONNECT-PARAMS-VALID-UNSECURE, it's duplicate to WIFI_CONNECT with remains moved to WIFI-CONNECT-SECURE
`ESP8266Interface::connect()` and `ESP8266Interface::disconnect()` can be used in terms of asynchronous operations. Mainly, it is based on newly added private variable of type `esp_connection_software_status` which is used to keep tracking of state of connection.`wifi_connect_nonblock` test was renamed and amended to test both `connect()` and `disconnect()` operation