bpo-31904: Fix test_ftplib failures for VxWorks RTOS (GH-19447)

Lib/test/support/__init__.py

@@ -89,6 +89,8 @@ if sys.platform == 'win32' and ' 32 bit (ARM)' in sys.version:
     # bpo-37553: test_socket.SendfileUsingSendTest is taking longer than 2
     # seconds on Windows ARM32 buildbot
     LOOPBACK_TIMEOUT = 10
+elif sys.platform == 'vxworks':
+    LOOPBACK_TIMEOUT = 10
 
 # Timeout in seconds for network requests going to the Internet. The timeout is
 # short enough to prevent a test to wait for too long if the Internet request

Misc/NEWS.d/next/Tests/2020-04-09-15-40-03.bpo-31904.TJ4k3d.rst

@@ -0,0 +1 @@
+Increase LOOPBACK_TIMEOUT to 10 for VxWorks RTOS.