BUG/MEDIUM: lua: Reset analyse expiration timeout before executing a lua action

BUG/MEDIUM: lua: Reset analyse expiration timeout before executing a lua action

Before executing a lua action, the analyse expiration timeout of the
corresponding channel must be reset. Otherwise, when it expires, for instance
because of a call to core.msleep(), if the action yields, an expired timeout
will be used for the stream's task, leading to a loop.

This patch should fix the issue #661. It must be backported in all versions
supporting the lua.