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AbstractContextManager is used but not as expected.
The only class that overrides _context_entered (SQLiteDB) also overrides exist.
So in SQLiteDB enter and exit are now implemented directly
No class overirdes _context_exception_occurred so this method makes no sense.
Keeping a simplified AbstractContextManager is needed as Spalloc pass these around and there is not better definition / Abstract
Must be done after SpiNNakerManchester/SpiNNFrontEndCommon#1130
related work can be done before or after
SpiNNakerManchester/SpiNNMan#368
SpiNNakerManchester/spalloc#88