AsyncStreamHandlerTest.asyncOptionsTest() is flaky

[TomGranot]

Following #1728 (comment), it seems that AsyncStreamHandlerTest.asyncOptionsTest() is flaky - there are a few different servers behind http://apache.org, and each returns either 4 or 5 methods based on the server we happened upon, crashing the test:

tom@Toms-MacBook-Pro async-http-client-fork % curl -i -X OPTIONS http://www.apache.org/
HTTP/1.1 200 OK
Date: Mon, 28 Sep 2020 11:24:45 GMT
Server: Apache/2.4.18 (Ubuntu)
Allow: POST,OPTIONS,GET,HEAD
Cache-Control: max-age=3600
Expires: Mon, 28 Sep 2020 12:24:45 GMT
Content-Length: 0
Content-Type: text/html

tom@Toms-MacBook-Pro async-http-client-fork % curl -i -X OPTIONS http://www.apache.org/
HTTP/1.1 200 OK
Date: Mon, 28 Sep 2020 11:53:21 GMT
Server: Apache
Allow: GET,POST,OPTIONS,HEAD,TRACE
Cache-Control: max-age=3600
Expires: Mon, 28 Sep 2020 12:53:21 GMT
Content-Length: 0
Content-Type: text/html

I need to rewrite so it does not rely on http://apache.org.

[TomGranot]

Closed by #1753.