Problem: extra abstraction layer type poller_t is in zmq.hpp

Solution: move to zmq_addon.hpp, rename to active_poller_t, and rename base_poller_t to poller_t

Author: sigiesec

tests/CMakeLists.txt

@@ -25,7 +25,7 @@ add_executable(
     message.cpp
     context.cpp
     socket.cpp
-    poller.cpp
+    active_poller.cpp
     multipart.cpp
     )