To avoid the obvious problem, use a different port...

There's another test that opens an hard-coded port to talk to debugserver
(TestPlatformSDK.py).  Make sure this port and the one in that other
test are different to avoid that potential conflict.

lldb/test/API/functionalities/launch_stop_at_entry/TestStopAtEntry.py

@@ -18,7 +18,7 @@ class TestStopAtEntry(TestBase):
     NO_DEBUG_INFO_TESTCASE = True
 
     # The port used by debugserver.
-    PORT = 54637
+    PORT = 54638
 
     # The number of attempts.
     ATTEMPTS = 10