Travis-CI: adjust out-of-tree settings

- run for each kernel version 3 times
- no more than 20 minutes for exploit testing
- success if more than 95% of runs is ok

.travis.yml

@@ -36,4 +36,4 @@ before_script:
 script:
   - |
     cd $TRAVIS_BUILD_DIR/$EXPLOIT
-    sudo $(which out-of-tree) pew --max=8
+    sudo $(which out-of-tree) pew --runs=3 --timeout=20m --threshold=0.95