tests: Fix lingering Python 2 isms

tests/bench/fork.py

@@ -5,6 +5,12 @@ Measure latency of .fork() setup/teardown.
 import mitogen
 import mitogen.core
 
+try:
+    xrange
+except NameError:
+    xrange = range
+
+
 @mitogen.main()
 def main(router):
     t0 = mitogen.core.now()
@@ -12,4 +18,4 @@ def main(router):
         t = mitogen.core.now()
         ctx = router.fork()
         ctx.shutdown(wait=True)
-    print '++', 1000 * ((mitogen.core.now() - t0) / (1.0+x))
+    print('++ %d' % 1000 * ((mitogen.core.now() - t0) / (1.0+x)))

tests/create_child_test.py

@@ -79,7 +79,7 @@ def close_proc(proc):
     proc.stdin.close()
     proc.stdout.close()
     if proc.stderr:
-        prco.stderr.close()
+        proc.stderr.close()
 
 
 def wait_read(fp, n):

tests/soak/cpu_load.py

@@ -25,7 +25,7 @@ def burn():
 
 mul = 1.5
 count = int(mul * multiprocessing.cpu_count())
-print count
+print(count)
 
 procs = [multiprocessing.Process(target=burn)
          for _ in range(count)]