sslutil: some more forcebytes() on some exception messages

At this point, test-https.t no longer dumps tracebacks
everywhere. Instead, we get some results that look like we're not
adequately finding things in hg's configuration, which should be
manageable (if somewhat annoying to find and fix.)

Differential Revision: https://phab.mercurial-scm.org/D2690

mercurial/sslutil.py

@@ -346,10 +346,11 b' def wrapsocket(sock, keyfile, certfile, '
 
     for f in (keyfile, certfile):
         if f and not os.path.exists(f):
-            raise error.Abort(_('certificate file (%s) does not exist; '
-                                'cannot connect to %s') % (f, serverhostname),
-                              hint=_('restore missing file or fix references '
-                                     'in Mercurial config'))
+            raise error.Abort(
+                _('certificate file (%s) does not exist; cannot connect to %s')
+                % (f, pycompat.bytesurl(serverhostname)),
+                hint=_('restore missing file or fix references '
+                       'in Mercurial config'))
 
     settings = _hostsettings(ui, serverhostname)
 
@@ -372,9 +373,10 b' def wrapsocket(sock, keyfile, certfile, '
         try:
             sslcontext.set_ciphers(pycompat.sysstr(settings['ciphers']))
         except ssl.SSLError as e:
-            raise error.Abort(_('could not set ciphers: %s') % e.args[0],
-                              hint=_('change cipher string (%s) in config') %
-                                   settings['ciphers'])
+            raise error.Abort(
+                _('could not set ciphers: %s') % util.forcebytestr(e.args[0]),
+                hint=_('change cipher string (%s) in config') %
+                settings['ciphers'])
 
     if certfile is not None:
         def password():