We now no longer set ifValueNotExists() in ReactiveHashCommands.hMSet to always upsert hash entries. Previously, we called HSETNX if hMSet was called with a single tuple which did not overwrite existing entries.
Align return value of hMSet to return always true as calling internally HSET returns 1 only on newly set hash fields and setting an existing field resulted previously in false.
Original Pull Request: #325