stream-clone-test: simplify the case where server disabled it
We have an option to disable it, we don't need to test it with all protocol
variants.
In addition there is little value in looking at the bytes to bytes details of
the reply. Such check is very fragile and consume a lot of time for little
value when adjusting formats, caches, and protocol.
Our full contribution guidelines are in our wiki, please see:
https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).