protocol: declare transport protocol name

protocol: declare transport protocol name

We add an attribute to the HTTP and SSH protocol implementations
identifying the transport so future patches can conditionally
expose capabilities on a per-transport basis.

--- a/mercurial/hgweb/protocol.py	Wed Nov 16 19:45:35 2016 +0100
+++ b/mercurial/hgweb/protocol.py	Mon Nov 28 20:46:59 2016 -0800
@@ -30,6 +30,8 @@
         self.req = req
         self.response = ''
         self.ui = ui
+        self.name = 'http'
+
     def getargs(self, args):
         knownargs = self._args()
         data = {}

--- a/mercurial/sshserver.py	Wed Nov 16 19:45:35 2016 +0100
+++ b/mercurial/sshserver.py	Mon Nov 28 20:46:59 2016 -0800
@@ -26,6 +26,7 @@
         self.lock = None
         self.fin = ui.fin
         self.fout = ui.fout
+        self.name = 'ssh'
 
         hook.redirect(True)
         ui.fout = repo.ui.fout = ui.ferr