Remove compile time transport interface switch

- Remove the compile time check of the transport implementation.
  The transport (zeromq/nanomsg) can be chosen at run time with:
  `device.SetTransport("zeromq"); // possible values are "zeromq" and "nanomsg"`.

  For devices that use FairMQProgOptions, the transport can be configured via cmd option:
  `--transport zeromq` or `--transport nanomsg`. Default values is "zeromq".
  The device receives the configured value with:
  `device.SetTransport(config.GetValue<std::string>("transport"));`

  Old method of setting transport still works. But the NANOMSG constant is not defined.

- Remove old `fairmq/prototest` directory. It was only used as a test for protobuf.
  The protobuf part of Tutorial3 does the same (with different values).

- Fix a bug in FairMQPollerNN, where the `revents` value was not initialized.
  This caused the `poller->CheckOutput()` to trigger when it should not.

fairmq/CMakeLists.txt

@@ -8,9 +8,6 @@
 
 configure_file(${CMAKE_SOURCE_DIR}/fairmq/run/startBenchmark.sh.in ${CMAKE_BINARY_DIR}/bin/startBenchmark.sh)
 configure_file(${CMAKE_SOURCE_DIR}/fairmq/run/benchmark.json ${CMAKE_BINARY_DIR}/bin/config/benchmark.json)
-# following scripts are only for protobuf tests and are not essential part of FairMQ
-# configure_file(${CMAKE_SOURCE_DIR}/examples/advanced/Tutorial3/MQ/run/startBin.sh.in ${CMAKE_BINARY_DIR}/bin/startBin.sh)
-# configure_file(${CMAKE_SOURCE_DIR}/examples/advanced/Tutorial3/MQ/run/startProto.sh.in ${CMAKE_BINARY_DIR}/bin/startProto.sh)
 
 add_subdirectory(logger)
 add_subdirectory(test)
@@ -30,19 +27,8 @@ Set(SYSTEM_INCLUDE_DIRECTORIES
   ${ZMQ_INCLUDE_DIR}
 )
 
-If(PROTOBUF_FOUND)
-  Set(INCLUDE_DIRECTORIES
-    ${INCLUDE_DIRECTORIES}
-    # following directory is only for protobuf tests and is not essential part of FairMQ
-    # ${CMAKE_SOURCE_DIR}/fairmq/prototest
-  )
-  Set(SYSTEM_INCLUDE_DIRECTORIES
-    ${SYSTEM_INCLUDE_DIRECTORIES}
-    ${PROTOBUF_INCLUDE_DIR}
-  )
-EndIf(PROTOBUF_FOUND)
-
 If(NANOMSG_FOUND)
+  add_definitions(-DNANOMSG_FOUND)
   Set(INCLUDE_DIRECTORIES
     ${INCLUDE_DIRECTORIES}
     ${CMAKE_SOURCE_DIR}/fairmq/nanomsg
@@ -91,31 +77,6 @@ Set(SRCS
   "options/FairMQParser.cxx"
 )
 
-If(PROTOBUF_FOUND)
-  # following source files are only for protobuf tests and are not essential part of FairMQ
-  # add_custom_command(
-  #   OUTPUT
-  #     ${CMAKE_CURRENT_BINARY_DIR}/payload.pb.h
-  #     ${CMAKE_CURRENT_BINARY_DIR}/payload.pb.cc
-  #   COMMAND
-  #     ${SIMPATH}/bin/protoc -I=. --cpp_out=${CMAKE_CURRENT_BINARY_DIR} payload.proto
-  #   WORKING_DIRECTORY
-  #     ${CMAKE_SOURCE_DIR}/fairmq/prototest
-  #   )
-  # set(SRCS
-  #   ${SRCS}
-  #   ${CMAKE_CURRENT_BINARY_DIR}/payload.pb.cc
-  #   "prototest/FairMQProtoSampler.cxx"
-  #   "prototest/FairMQBinSampler.cxx"
-  #   "prototest/FairMQBinSink.cxx"
-  #   "prototest/FairMQProtoSink.cxx"
-  # )
-  Set(DEPENDENCIES
-    ${DEPENDENCIES}
-    ${PROTOBUF_LIBRARY}
-  )
-Endif(PROTOBUF_FOUND)
-
 If(NANOMSG_FOUND)
   Set(SRCS
     ${SRCS}
@@ -124,12 +85,9 @@ If(NANOMSG_FOUND)
     "nanomsg/FairMQSocketNN.cxx"
     "nanomsg/FairMQPollerNN.cxx"
   )
-  Set(DEPENDENCIES
-    ${DEPENDENCIES}
-    ${NANOMSG_LIBRARY_SHARED}
-  )
 EndIf(NANOMSG_FOUND)
 
+
 # to copy src that are header-only files (e.g. c++ template) for FairRoot external installation
 # manual install (globbing add not recommended)
 Set(FAIRMQHEADERS
@@ -163,6 +121,13 @@ Set(DEPENDENCIES
   boost_regex
 )
 
+If(NANOMSG_FOUND)
+  Set(DEPENDENCIES
+    ${DEPENDENCIES}
+    ${NANOMSG_LIBRARY_SHARED}
+  )
+EndIf(NANOMSG_FOUND)
+
 Set(LIBRARY_NAME FairMQ)
 
 GENERATE_LIBRARY()
@@ -176,17 +141,6 @@ Set(Exe_Names
   proxy
 )
 
-# following executables are only for protobuf tests and are not essential part of FairMQ
-# if(PROTOBUF_FOUND)
-#   set(Exe_Names
-#       ${Exe_Names}
-#       binsampler
-#       protosampler
-#       binsink
-#       protosink
-#       )
-# endif(PROTOBUF_FOUND)
-
 Set(Exe_Source
   run/runBenchmarkSampler.cxx
   run/runSink.cxx
@@ -196,17 +150,6 @@ Set(Exe_Source
   run/runProxy.cxx
 )
 
-# following source files are only for protobuf tests and are not essential part of FairMQ
-# if(PROTOBUF_FOUND)
-#   set(Exe_Source
-#       ${Exe_Source}
-#       prototest/runBinSampler.cxx
-#       prototest/runProtoSampler.cxx
-#       prototest/runBinSink.cxx
-#       prototest/runProtoSink.cxx
-#       )
-# endif(PROTOBUF_FOUND)
-
 list(LENGTH Exe_Names _length)
 math(EXPR _length ${_length}-1)