update px pylab test to match new output of pylab

IPython/parallel/tests/test_magics.py

@@ -322,8 +322,7 b' class TestParallelMagics(ClusterTestCase, ParametricTestCase):'
         with capture_output() as io:
             ip.magic("px %pylab inline")
         
-        self.assertTrue("Welcome to pylab" in io.stdout, io.stdout)
-        self.assertTrue("backend_inline" in io.stdout, io.stdout)
+        self.assertTrue("Populating the interactive namespace from numpy and matplotlib" in io.stdout, io.stdout)
         
         with capture_output() as io:
             ip.magic("px plot(rand(100))")