wireproto: only expose "debugwireargs" to version 1 transports
I'm not even sure this command should be enabled for version 1
transports. It is just a reflection endpoint for argument data.
We definitely don't need to support it in version 2.
Differential Revision: https://phab.mercurial-scm.org/D3184
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).