call setinputsizes() for integer types

call setinputsizes() for integer types

Altered the Oracle dialect such that when an :class:`.Integer` type is in
use, the cx_Oracle.NUMERIC type is set up for setinputsizes().  In
SQLAlchemy 1.1 and earlier, cx_Oracle.NUMERIC was passed for all numeric
types unconditionally, and in 1.2 this was removed to allow for better
numeric precision.  However, for integers, some database/client setups
will fail to coerce boolean values True/False into integers which introduces
regressive behavior when using SQLAlchemy 1.2.  Overall, the setinputsizes
logic seems like it will need a lot more flexibility going forward so this
is a start for that.

Change-Id: Ida80cc2c2c37ffc0e05da4b5df2dadfab55a01f2
Fixes: #4259