strip leading 'ESC[?1034h' in tests caused by `import readline`

`import readline` causes 'ESC[?1034h' to be the first output sometimes,
so strip that off the front of the first line if it is found.

This has been reported to RedHat in 2007, but appears to only apply to
OSX 10.7 at the moment.

closes gh-662

IPython/testing/tools.py

@@ -213,7 +213,18 b' def ipexec(fname, options=None):'
     full_fname = os.path.join(test_dir, fname)
     full_cmd = '%s %s %s' % (ipython_cmd, cmdargs, full_fname)
     #print >> sys.stderr, 'FULL CMD:', full_cmd # dbg
-    return getoutputerror(full_cmd)
+    out = getoutputerror(full_cmd)
+    # `import readline` causes 'ESC[?1034h' to be the first output sometimes,
+    # so strip that off the front of the first line if it is found
+    if out:
+        first = out[0]
+        m = re.match(r'\x1b\[[^h]+h', first)
+        if m:
+            # strip initial readline escape
+            out = list(out)
+            out[0] = first[len(m.group()):]
+            out = tuple(out)
+    return out
 
 
 def ipexec_validate(fname, expected_out, expected_err='',