[web] Fix expiry of anonymous sessions (closes #4154479) Things like: try: foo except: bar else: baz doesn't work very well if you expect baz to run even in the exception case. Plus, session.cnx.check() is a dbapi remnant, so drop it and just look at session.mtime.

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#!/usr/bin/env python

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from cubicweb.cwctl import run

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import sys

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run(sys.argv[1:])