[connection] move security control logic on Connection The _security_enabled context manager now operate on connection. We have to keep a specific entry point in Session to ensure Connection object are properly cleaned up when using session to "manage" Connection live cycle. Related to #2503918

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−addressbook
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−basket
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−blog
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−book
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−calendar
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−comment
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−company
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−email
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−file
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−folder
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−i18ncontent
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−keyword
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−link
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−mailinglist
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−person
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−tag
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−timeseries
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−vcsfile