Resolve import of autorest code

[tracyboehrer]

To get around Java 1.7 dependency, RxJava use, and some Jackson serializer issues the autorest code from https://github.com/Azure/autorest-clientruntime-for-java/tree/master/client-runtime/src/main/java/com/microsoft/rest was copied into bot-connector.

Unknown if the com.microsoft.bot.azure package is needed or if there is an alternative to now "owning" this code. At the very least the AzureJacksonAdaptor (and it's dependencies), and AzureResponseBuilder are being used.

Options

1. Bite the bullet and live with Java 1.7 and RxJava and used release autorest client. Not preferred.
2. Retain imported code as is (with mods). This allows us to more easily update when the official version improves.
3. Retain imported code, but reduce to only the needed classes.
4. Write our own. See https://stackoverflow.com/questions/221442/how-do-you-create-a-rest-client-for-java. The OkHttp + RetroFit is likely still a valid option. But then... we are basically talking about option 3.

List of potential clients
https://stackoverflow.com/questions/221442/how-do-you-create-a-rest-client-for-java