Fix APEL ssmsend after Python3 conversion
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This merge request is automatically copied from !326 (merged) orginally made by @andrii
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After Python3 conversion modified APEL ssmsend script stopped working because of modules import failure.
Failure caused mainly because of import was done in the bad way.
Module import was reworked and ssm python module was relocated to the convenient place (includes packaging fixes). SSM code also updated to the latest stable release (2.3.0)