Revert "Merge branch 'SubSlotExceptions' into 'master'"

This reverts merge request !979
12 jobs for revert-5249b27a in 34 minutes and 8 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
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build:gcc8:opt

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build:gcc9:opt

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build:gcc9:opt:python3

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check-formatting

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  Test
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check-copyright

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cvmfs
test:gcc8:opt

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test:gcc9:dbg

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cvmfs
test:gcc9:opt

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test:gcc9:opt:python3

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test_public_headers_build

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test-python3

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