wireprotoserver: remove sshserver.getarg() AFAICT the last consumer of this helper method was removed by d054cc5c7737 in 2010. Differential Revision: https://phab.mercurial-scm.org/D1987

wireprotoserver: remove lock references AFAICT sshserver.lock is unused. The last caller of it disappeared in 9f6e0e7ef828 ~18 months ago as part of removing code to support ancient wire protocol commands. Let's remove some dead code. Differential Revision: https://phab.mercurial-scm.org/D1986

wireprotoserver: remove support for do_<command> handlers (API) Old versions of wire protocol handlers relied on methods named do_<command> to handle wire protocol commands. The last definition of these methods on sshserver was removed by 9f6e0e7ef828 ~2 years ago. I think it's time to not support this mechanism for defining command handlers. .. api:: sshserver no longers looks for wire protocol command handlers in methods named do_<command>. Use @wireproto.wireprotocommand to declare wire protocol command handler functions. Differential Revision: https://phab.mercurial-scm.org/D1985