tests: don't prompt to launch gdb for sanity test case

Type: test

Change-Id: I4c54121b76b341381a819cee928c3c2455a83503
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>

test/sanity_run_vpp.py

@@ -2,7 +2,7 @@
 
 from __future__ import print_function
 from multiprocessing import Pipe
-from sys import exit
+import sys
 import os
 from framework import VppDiedError, VppTestCase, KeepAliveReporter
 
@@ -11,9 +11,20 @@ class SanityTestCase(VppTestCase):
     """ Sanity test case - verify whether VPP is able to start """
     pass
 
+    # don't ask to debug SanityTestCase
+    @classmethod
+    def wait_for_enter(cls, pid=0):
+        pass
+
+    @classmethod
+    def _debug_quit(cls):
+        try:
+            cls.vpp.poll()
+        except AttributeError:
+            pass
+
 
 if __name__ == '__main__':
-    os.environ["RND_SEED"] = "1"
     rc = 0
     tc = SanityTestCase
     x, y = Pipe()
@@ -26,14 +37,14 @@ if __name__ == '__main__':
     else:
         try:
             tc.tearDownClass()
-        except:
-            pass
+        except Exception:
+            rc = -1
     x.close()
     y.close()
 
     if rc == 0:
-        print('Sanity test case passed\n')
+        print('Sanity test case passed.\n')
     else:
-        print('Sanity test case failed\n')
+        print('Sanity test case failed.\n')
 
-    exit(rc)
+    sys.exit(rc)