Android support for native C++ code

[maxgolov]

Provide a set of build cmake scripts and java to compile C++ telemetry SDK for Android using Android NDK.
This will use the Android-preferred Java HttpUrlConnection library, a Java thread pool, and Java shim layer to implement an android implementation of IHttpClient.

[maxgolov]

@larvacea - Martin, since you are working on Android implementation - would you mind to take the ownership of this work item?

[larvacea]

Sure thing, though in fact what I am working on has a Java layer and routes http through the Android-preferred java library.

[maxgolov]

@larvacea - that's even better! :) ... I was just wondering:

• either we need to close that old issue; or
• edit it to reflect the upcoming Android support.

[larvacea]

Edited the issue to reflect what I am currently testing.

[maxgolov]

@larvacea - can we close this? Would you be able to share the build scripts and instructions for others to consume the results of your Android porting effort? Thank you!