ipsec: VPP-1316 calculate IP/TCP/UDP inner checksums

Calculate IP/TCP/UDP checksums in software before adding authentication.

Change-Id: I3e121cb00aeba667764f39ade8d62170f18f8b6b
Signed-off-by: Klement Sekera <ksekera@cisco.com>

test/discover_tests.py

@@ -30,7 +30,7 @@ def discover_tests(directory, callback):
                 continue
             if not issubclass(cls, unittest.TestCase):
                 continue
-            if name == "VppTestCase":
+            if name == "VppTestCase" or name.startswith("Template"):
                 continue
             for method in dir(cls):
                 if not callable(getattr(cls, method)):