Add logging to help debug this issue.

Shows:
TelephonyNetworkFactories:
    {TelephonyNetworkFactory - ScoreFilter=50, Filter=[ Transports:
    CELLULAR Capabilities: MMS&SUPL&DUN&FOTA&IMS&CBS&IA&RCS&XCAP&EIMS&
    INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN Specifier: <2>],
    requests=1, refCount=0}
        {NetworkRequest [ id=1, legacyType=-1, [ Capabilities:
        INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN] ], score=50, requested=true}

bug:20731384
Change-Id: I6a38f195609ad01ff2a2584d07945540ae421586