Mark TestTerminal.py as XFAIL on OS X.

See the following tracking bug:
https://llvm.org/bugs/show_bug.cgi?id=25484

llvm-svn: 252699

lldb/packages/Python/lldbsuite/test/functionalities/tty/TestTerminal.py

@@ -20,6 +20,7 @@ class LaunchInTerminalTestCase(TestBase):
     # a program in a separate terminal window. It would be great if other platforms
     # added support for this.
     @skipUnlessDarwin
+    @expectedFailureDarwin("llvm.org/pr25484")
     # If the test is being run under sudo, the spawned terminal won't retain that elevated
     # privilege so it can't open the socket to talk back to the test case
     @unittest2.skipIf(hasattr(os, 'geteuid') and os.geteuid() == 0, "test cannot be run as root")