message: Fix uninitialized memory in SstParamParser
  There are 4 bytes of padding inside _SstParams which never get
  initialized by SstParamParser. memset() the whole thing to zero.
diff: @@ -10,6 +10,8 @@ using namespace adios2::core;
  void SstParamParser::ParseParams(IO &io, struct _SstParams &Params)
  {
  + std::memset(&Params, 0, sizeof(Params));
  +
  auto lf_SetBoolParameter = [&](const std::string key, int &parameter) {
  auto itKey = io.m_Parameters.find(key);
  if (itKey != io.m_Parameters.end())
  