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-3530 ISPN-1855 Keep per-cache CH to route requests correctly

* It fixes an issue where accessing non-distributed caches can
break topology updates.
* Add asymmetric routing test that forces each server to hash
only to itself to replicate situations where different distributed
caches have different CH.