BUG/MINOR: http-ana: Only consider client abort for abortonclose

BUG/MINOR: http-ana: Only consider client abort for abortonclose

When abortonclose option is enabled (by default since 3.3), the HTTP rules
can no longer yield if the client aborts. However, stream aborts were also
considered. So it was possible to interrupt yielding rules, especially on
the response processing, while the client was still waiting for the
response.

So now, when abortonclose option is enabled, we now take care to only
consider client aborts to prevent HTTP rules to yield.

Many thanks to @DirkyJerky for his detailed analysis.

This patch should fix the issue #3306. It should be backported as far as
2.8.