sslutil: make messages for Python without certificate handling more helpful

We now explain why there is no certificate to verify and do not give hints
about cacerts when they can't be used anyway.

mercurial/sslutil.py

@@ -122,8 +122,7 b' class validator(object):'
                                  (host, nicefingerprint))
             else: # python 2.5 ?
                 if hostfingerprint:
-                    raise util.Abort(_('no certificate for %s with '
-                                       'configured hostfingerprint') % host)
-                self.ui.warn(_('warning: %s certificate not verified '
-                               '(check web.cacerts config setting)\n') %
-                             host)
+                    raise util.Abort(_("host fingerprint for %s can't be "
+                                       "verified (Python too old)") % host)
+                self.ui.warn(_("warning: certificate for %s can't be "
+                               "verified (Python too old)\n") % host)