[#42] Add low level HTTP request tracing to the client

[tdiesler]

Signed-off-by: Thomas Diesler tdiesler@redhat.com

[etschelp]

This is not really needed because okhttp already has a solution for this see: https://github.com/square/okhttp/tree/master/okhttp-logging-interceptor

As the client supports passing a custom OkHttpClient, the interceptor can easily be injected without code changes. As others already do it this way your changes could potentially lead to duplicated output. But what we could do is add a default interceptor that uses slf4j and is set to trace, and redacts the headers. Like this no changes to the call() methods are needed.

[tdiesler]

ok, great

[etschelp]

replaced by: #46