Initial codes for Quality network selection

    In this change list, the old WifiAutojoin module is
    refactored initially. The old WifiAutojoinController is
    replaced with a new WifiQualifiedNetworkSelector.
    WifiConfiguration, WifiConfigureStore and
    WifiStateMachine have been modified accordingly. The new
    network selection logic is refactored with a more clear
    and deterministci one. To refer to thedescribed in
    details, in "Quality Network Selection and Connectivity
    Scan Management in N". The link of the document is:
    https://docs.google.com/document/d
    /1JPTa2NEk-PgjCJ16fIrR6ohV-kDKveDlYDOeiMCB2_c

cherry-picked from 8d106780
and make changes on WiFiConfigurationSerializer.java since
it is not on mm-wireless-dev
Bug:26012244
Change-Id: I44e454544b630b891c9a58a18b5a028edcce580f