Add support for primitive keys for CacheJdbcStore

[Alexey Kuznetsov <ak...@gridgain.com>]

Hi!

Current implementation
of org.apache.ignite.cache.store.jdbc.CacheAbstractJdbcStore requires to
have two classes in type metadata: key class and value class (PersonKey and
Person for example).

But in most cases key class is just a wrapper over primitive key and in
case of  *ONE type per cache *it will be useful to allow primitive
(Integer, Long, String,...) type as key (Integer and Person for example).

If user will try to register in CacheTypeMetadata more than one class with
same primitive key we will throw exception like this "Only single type per
cache allowed with same key class".

Thoughts?

-- 
Alexey Kuznetsov
GridGain Systems
www.gridgain.com