travis: Disable tests since cannot run sanlock daemon
travis: Disable tests since cannot run sanlock daemon

Unfortunately the sanlock package is blacklisted on Travis. Without this we
cannot run the deamon and therefore cannot run the tests.

Signed-off-by: Si Beaumont <a0992b7f1f450b4c7716d34b81a2d6f0877ae11a@citrix.com>

simonjbeaumont/ocaml-sanlock