sshpeer: log remote capabilities after protocol upgrade

This helps reduce variance with version 1 and will help prevent
test output divergence as we start testing protocol version 2 more
widely.

Differential Revision: https://phab.mercurial-scm.org/D2205

mercurial/sshpeer.py

@@ -313,6 +313,8 b' def _performhandshake(ui, stdin, stdout,'
         if not capsline.startswith('capabilities: '):
             badresponse()
 
+        ui.debug('remote: %s\n' % capsline)
+
         caps.update(capsline.split(':')[1].split())
         # Trailing newline.
         stdout.read(1)

tests/test-ssh-proto.t

@@ -484,6 +484,7 b' Send an upgrade request to a server that'
   devel-peer-request:   pairs: 81 bytes
   sending between command
   protocol upgraded to exp-ssh-v2-0001
+  remote: capabilities: lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 $USUAL_BUNDLE2_CAPS_SERVER$ unbundle=HG10GZ,HG10BZ,HG10UN
   url: ssh://user@dummy/server
   local: no
   pushable: yes
@@ -500,6 +501,7 b' Verify the peer has capabilities'
   devel-peer-request:   pairs: 81 bytes
   sending between command
   protocol upgraded to exp-ssh-v2-0001
+  remote: capabilities: lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 $USUAL_BUNDLE2_CAPS_SERVER$ unbundle=HG10GZ,HG10BZ,HG10UN
   Main capabilities:
     batch
     branchmap