Telemetry with array-type values can't be written to influxdb

Writing telemetry with FieldList objects to InfluxDB fails. The InfluxDB responds with a "invalid boolean" error when it receives a payload with FieldList objects. The FieldList class needs a decode function similar to the decode function in the dtype.ArrayType class which can be called when generating the data payload in the insert function within the InfluxDBBackend plugin.

Error messages in the console:

A potential fix in the InfluxDBBackend plugin would look like:

    def insert(self, packet, time=None, **kwargs):
        fields = {}
        pd = packet._defn

        for defn in pd.fields:
            val = getattr(packet.raw, defn.name)

            if pd.history and defn.name in pd.history:
                val = getattr(packet.history, defn.name)

            if val is not None and not (isinstance(val, float) and math.isnan(val)):
                if isinstance(val, FieldList):
                    fields[defn.name] = val.decode()

Start with the FieldList class and the decode function in ait/core/dtype.py, using the linked ArrayType implementation as a reference. Then inspect the InfluxDBBackend insert function and verify that FieldList values produce a valid InfluxDB payload without the invalid boolean error; add or run the relevant backend tests if available.