Correct failure decorator in test_fd_leak_multitarget

The random module in Python 2.7.8 and later leaks /dev/[u]random into
children. The test is expected to fail, not be flakey.

This will be fixed in Python 2.7.10 for some operating systems, but not
all e.g. OS X 10.4.

llvm.org/pr23983
bugs.freebsd.org/197376
bugs.python.org/issue23458

llvm-svn: 240958

lldb/test/functionalities/avoids-fd-leak/TestFdLeak.py

@@ -41,7 +41,7 @@ class AvoidsFdLeakTestCase(TestBase):
         self.assertTrue(process.GetExitStatus() == 0,
                 "Process returned non-zero status. Were incorrect file descriptors passed?")
 
-    @expectedFlakey(lambda x: sys.version_info >= (2, 7, 8), "bugs.freebsd.org/197376") # python random leaks fd
+    @expectedFailure(lambda x: sys.version_info >= (2, 7, 8), "bugs.freebsd.org/197376") # python random leaks fd
     @expectedFlakeyLinux
     @skipIfWindows # The check for descriptor leakage needs to be implemented differently here.
     @skipIfTargetAndroid() # Android have some other file descriptors open by the shell