[server/session] Roll back in connection exit This was changed in commit 8b35a898b334 "[server] remove cnxset tracking, it is now unneeded". When exiting a CubicWeb Connection, the database connection is put back into the common pool. At that point anything done during the lifetime of the CubicWeb Connection needs to be committed or rolled back. Do a proper rollback to finish the transaction, as was happening before the above-mentionned commit. This showed up on testing with postgresql, when a DB schema modification was blocked by an old connection that was still "in transaction".

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# -*- coding: utf-8 -*-

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# copyright %(year)s %(author)s, all rights reserved.

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# contact %(author-web-site)s -- mailto:%(author-email)s

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#

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%(long-license)s

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