[C++ OTF]: fix to grab namespace and use updated serialized IR frame. Should fix aeron-io#73 and aeron-io#74.

Author: tmontgomery

main/cpp/otf_api/IrCollection.h

@@ -200,7 +200,8 @@ class IrCollection
  char tmp[256];
 
  frame.wrapForDecode(buffer_, offset, frame.blockLength(), frame.templateVersion());
- tmpLen = frame.getPackageVal(tmp, sizeof(tmp));
+ tmpLen = frame.getPackageName(tmp, sizeof(tmp));
+ frame.getNamespaceName(tmp, sizeof(tmp));
 
  ::std::cout << "Reading IR package=\"" << std::string(tmp, tmpLen) << "\"" << ::std::endl;