Fixed DBAL-139 Oracle's sequences with NOCACHE 

Added cache size to sequence object.
NOCACHE is set with value 0.

Tested on local machine with test function but there is 5 tests that fails on current master branch on oracle DB 11.2.0.1 so  I did not  incorporate my test function for this.

I'e used WriteTest and added 3 more sequences with cache 0,1 and 55 and it passed, sequences are created in current schema on oracle db.