BUG/MINOR: hlua/htx: Reset channels analyzers when txn:done() is called

BUG/MINOR: hlua/htx: Reset channels analyzers when txn:done() is called

For HTX streams, when txn:done() is called, the work is delegated to the
function http_reply_and_close(). But it is not enough. The channel's analyzers
must also be reset. Otherwise, some analyzers may still be called while
processing should be aborted.

For instance, if the function is called from an http-request rules on the
frontend, request analyzers on the backend side are still called. So we may try
to add an header to the request, while this one was already reset.

This patch must be backported to 2.0 and 1.9.