Support SST as a write method in adios_reorganize

Podhorszki, Norbertrequested to merge
github/fork/keichi/reorganize-to-sst into master

Created by: keichi

Fixes the following error when using SST as a write method in adios_reorganize:

ERROR: When using the SST engine in ADIOS2, Put() calls must appear between BeginStep/EndStep pairs

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