cmdserver: include non-zero return code of runcommand in test output

tests/test-commandserver.py

@@ -51,7 +51,10 b' def runcommand(server, args, output=sys.'
         elif ch == 'L':
             writeblock(server, input.readline(data))
         elif ch == 'r':
-            return struct.unpack('>i', data)[0]
+            ret, = struct.unpack('>i', data)
+            if ret != 0:
+                print ' [%d]' % ret
+            return ret
         else:
             print "unexpected channel %c: %r" % (ch, data)
             if ch.isupper():

tests/test-commandserver.py.out

@@ -142,6 +142,7 b' testing rollback:'
 
  runcommand phase -r . -p
 no phases changed
+ [1]
  runcommand commit -Am.
  runcommand rollback
 repository tip rolled back to revision 3 (undo commit)