py3: use multi-line import in test-wireproto.py

The reason I did it is that I had a later commit that was adding to the list.

tests/test-wireproto.py

@@ -1,59 +1,60 b''
 from __future__ import absolute_import, print_function
 
 import StringIO
-
-from mercurial import wireproto
+from mercurial import (
+    wireproto,
+)
 
 class proto(object):
     def __init__(self, args):
         self.args = args
     def getargs(self, spec):
         args = self.args
         args.setdefault('*', {})
         names = spec.split()
         return [args[n] for n in names]
 
 class clientpeer(wireproto.wirepeer):
     def __init__(self, serverrepo):
         self.serverrepo = serverrepo
 
     def _capabilities(self):
         return ['batch']
 
     def _call(self, cmd, **args):
         return wireproto.dispatch(self.serverrepo, proto(args), cmd)
 
     def _callstream(self, cmd, **args):
         return StringIO.StringIO(self._call(cmd, **args))
 
     @wireproto.batchable
     def greet(self, name):
         f = wireproto.future()
         yield {'name': mangle(name)}, f
         yield unmangle(f.value)
 
 class serverrepo(object):
     def greet(self, name):
         return "Hello, " + name
 
     def filtered(self, name):
         return self
 
 def mangle(s):
     return ''.join(chr(ord(c) + 1) for c in s)
 def unmangle(s):
     return ''.join(chr(ord(c) - 1) for c in s)
 
 def greet(repo, proto, name):
     return mangle(repo.greet(unmangle(name)))
 
 wireproto.commands['greet'] = (greet, 'name',)
 
 srv = serverrepo()
 clt = clientpeer(srv)
 
 print(clt.greet("Foobar"))
 b = clt.batch()
 fs = [b.greet(s) for s in ["Fo, =;:<o", "Bar"]]
 b.submit()
 print([f.value for f in fs])