sessions: fix some problems with multiple init/fini #12868
Merged
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Fix a couple of problems uncovered in issue #12854.
Turns out the MCA param management system was "remembering" things even if a variable was deregistered when a framework was closed.
Also the test case showed that destructing ompi_mpi_session_null needs to be moved to ompi_mpi_instance_release.
Related to #12854