test: ci: Print test log if tests fail

Signed-off-by: Jacques de Laval <jacques@de-laval.se>

.travis.yml

@@ -62,4 +62,4 @@ script:
   - unshare -V
   - nsenter -V
   - chroot --version
-  - LD_LIBRARY_PATH=/tmp/lib make distcheck
+  - 'LD_LIBRARY_PATH=/tmp/lib make distcheck || cat finit-4.0-beta1/_build/sub/test/test-suite.log'