ISPN-4409 Upgrade to LevelDB 0.7 and fix server test assertions

* Upgrade to LevelDB 0.7 in order to align with server's Guava
version which currently is 16.x.
* Fixed LevelDB server test assertions to avoid having to instantiate
the cache's marshaller client side.
ISPN-4012 Mark mass indexing tests as unstable
ISPN-4405 Remove unnecessary Lucene dependencies causing build halt
ISPN-4406 Security integration tests should run sequentially

* This is because tests rely on static field initialisation.
* To support this, test cache manager factory must be able to cope with
checking if the cache is closed even if it's unauthorised.