repoview: make propertycache.setcache compatible with repoview Propertycache used standard attribute assignment. In the repoview case, this assignment was forwarded to the unfiltered repo. This result in: (1) unfiltered repo got a potentially wrong cache value, (2) repoview never reused the cached value. This patch replaces the standard attribute assignment by an assignment to `objc.__dict__` which will bypass the `repoview.__setattr__`. This will not affects other `propertycache` users and it is actually closer to the semantic we need. The interaction of `propertycache` and `repoview` are now tested in a python test file.

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'a' in d: True

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d['a']: va

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'b' in d: True

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d['b']: vb

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'c' in d: True

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d['c']: vc

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'd' in d: True

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d['d']: vd

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'a' in d: False

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'b' in d: True

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d['b']: vb

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'c' in d: True

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d['c']: vc

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'd' in d: True

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d['d']: vd

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'e' in d: True

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d['e']: ve

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'b' in d: True

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d['b']: vb2

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'c' in d: True

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d['c']: vc2

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'd' in d: True

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d['d']: vd

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'e' in d: False

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'f' in d: True

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d['f']: vf