Contexts update + buffer flushing + cleanup (#338)

* Update lib/rocprofiler-sdk/context/context.*

- get_registered_contexts functions (local copy)

* Update lib/rocprofiler-sdk/hsa/{queue,queue_controller}.cpp

- remove ROCPROFILER_BUFFER_TRACING_MEMORY_COPY code

* Update tests/kernel-tracing/kernel-tracing.cpp

- move stop() and flush() in tool_fini to before reporting of sizes of data collected

* Update lib/rocprofiler-sdk/hsa/hsa.*

- remove stale set_callback / activity_functor_t code

* Update lib/rocprofiler-sdk/buffer.cpp

- full wait instead of returning busy when buffer is busy
- use task_group::join instead of task_group::wait to fully wait for tasks to finish (bug fix)

* Update lib/rocprofiler-sdk/agent.cpp

- support agent mapping for CPU agents

* Remove direct access to vector of registered contexts

source/lib/rocprofiler-sdk/hsa/queue_controller.cpp

@@ -186,8 +186,7 @@ QueueController::init(CoreApiTable& core_table, AmdExtTable& ext_table)
         }
         else if(itr->buffered_tracer)
         {
-            if(itr->buffered_tracer->domains(ROCPROFILER_BUFFER_TRACING_KERNEL_DISPATCH) ||
-               itr->buffered_tracer->domains(ROCPROFILER_BUFFER_TRACING_MEMORY_COPY))
+            if(itr->buffered_tracer->domains(ROCPROFILER_BUFFER_TRACING_KERNEL_DISPATCH))
             {
                 enable_intercepter = true;
                 break;