Fix python3 support in bin/dulwich.

bin/dulwich

@@ -88,7 +88,7 @@ def cmd_fetch(args):
         determine_wants = r.object_store.determine_wants_all
     refs = client.fetch(path, r, progress=sys.stdout.write)
     print("Remote refs:")
-    for item in refs.iteritems():
+    for item in refs.items():
         print("%s -> %s" % item)
 
 
@@ -132,9 +132,9 @@ def cmd_dump_pack(args):
     for name in x:
         try:
             print("\t%s" % x[name])
-        except KeyError, k:
+        except KeyError as k:
             print("\t%s: Unable to resolve base %s" % (name, k))
-        except ApplyDeltaError, e:
+        except ApplyDeltaError as e:
             print("\t%s: Unable to apply delta: %r" % (name, e))
 
 
@@ -234,7 +234,7 @@ def cmd_rev_list(args):
 def cmd_tag(args):
     opts, args = getopt(args, '', [])
     if len(args) < 2:
-        print 'Usage: dulwich tag NAME'
+        print('Usage: dulwich tag NAME')
         sys.exit(1)
     porcelain.tag('.', args[0])
 
@@ -325,14 +325,15 @@ def cmd_status(args):
     status = porcelain.status(gitdir)
     if status.staged:
         sys.stdout.write("Changes to be committed:\n\n")
-        for kind, names in status.staged.iteritems():
+        for kind, names in status.staged.items():
             for name in names:
                 sys.stdout.write("\t%s: %s\n" % (kind, name))
         sys.stdout.write("\n")
     if status.unstaged:
         sys.stdout.write("Changes not staged for commit:\n\n")
         for name in status.unstaged:
-            sys.stdout.write("\t%s\n" % name)
+            sys.stdout.write("\t%s\n" %
+                    name.decode(sys.getfilesystemencoding()))
         sys.stdout.write("\n")
     if status.untracked:
         sys.stdout.write("Untracked files:\n\n")