message: 'sidre_conduit_json' is default sidre protocol when hdf5 is disabled.
diff: #ifdef AXOM_USE_HDF5
  # define SIDRE_DEFAULT_PROTOCOL "sidre_hdf5"
  #else
  -# define SIDRE_DEFAULT_PROTOCOL "sidre_json"
  +# define SIDRE_DEFAULT_PROTOCOL "sidre_conduit_json"
  #endif
  @@ -1057,8 +1057,8 @@ public:
  *
  * protocols:
  * sidre_hdf5 (default when Axom is configured with hdf5)
  - * sidre_json (default otherwise)
  - * sidre_conduit_json
  + * sidre_conduit_json (default otherwise)
  + * sidre_json
  *
  * conduit_hdf5
  * conduit_bin
  