wireprotov1peer: update all rpcs to use the new batchable scheme
If desired, we could keep the future class and the function that
upgrades an old style rpc instead of a new style, for extensions.
Differential Revision: https://phab.mercurial-scm.org/D11212
#if no-windows no-osx
$ mkdir -p xdgconf/hg
$ echo '[ui]' > xdgconf/hg/hgrc
$ echo 'username = foobar' >> xdgconf/hg/hgrc
$ XDG_CONFIG_HOME="`pwd`/xdgconf" ; export XDG_CONFIG_HOME
$ unset HGRCPATH
$ hg config ui.username 2>/dev/null
foobar
#endif