fix some failing test

IPython/lib/tests/test_irunner_pylab_magic.py

@@ -83,8 +83,7 b' In \\[1\\]: from IPython\\.config\\.application import Application'
 In \[2\]: app = Application\.instance\(\)
 In \[3\]: app\.pylab_import_all = True
 In \[4\]: pylab
-^Welcome to pylab, a matplotlib-based Python environment
-For more information, type 'help\(pylab\)'\.
+^using matplotlib backend:
 In \[5\]: ip=get_ipython\(\)
 In \[6\]: \'plot\' in ip\.user_ns
 Out\[6\]: True
@@ -109,8 +108,7 b' In \\[1\\]: from IPython\\.config\\.application import Application'
 In \[2\]: app = Application\.instance\(\)
 In \[3\]: app\.pylab_import_all = False
 In \[4\]: pylab
-^Welcome to pylab, a matplotlib-based Python environment
-For more information, type 'help\(pylab\)'\.
+^using matplotlib backend:
 In \[5\]: ip=get_ipython\(\)
 In \[6\]: \'plot\' in ip\.user_ns
 Out\[6\]: False