wireprotoserver: rename webproto to httpv1protocolhandler
This matches our naming convention for the SSH server's protocol
handler.
Differential Revision: https://phab.mercurial-scm.org/D2218
httppeer: remove httpspeer
All it did was verify at construction time that Mercurial supports
TLS. instance() is what's used to construct peer instances. So
we can just inline this check into that function and do away with
the type variant.
Differential Revision: https://phab.mercurial-scm.org/D2216