since too long data description is now safe, no need to warn (#2301)

I think it's enough to have a debug log now, the warnings generate quite a lot of noise at the moment, while "too long" description is now safe to have.

Framework/src/HashDataDescription.cxx

@@ -56,7 +56,7 @@ auto createDataDescription(const std::string& name, size_t hashLength) -> o2::he
  return description;
  } else {
  const auto descriptionWithHash = createDescriptionWithHash(name, hashLength);
- ILOG(Warning, Devel) << "Too long data description name [" << name << "] changed to [" << descriptionWithHash << "]" << ENDM;
+ ILOG(Debug, Devel) << "Too long data description name [" << name << "] changed to [" << descriptionWithHash << "]" << ENDM;
  description.runtimeInit(descriptionWithHash.c_str());
  return description;
  }