In Quota model limit is defined with Integer type which in case of
MySQL and PostgreSQL is always stored in 4 bytes. At the same time,
the current validator checks that the value does not exceed sys.maxsize
which depends on whether the system is 32-bit or 64-bit based.
In SQLite Integer can be stored in 1, 2, 3, 4, 6, or 8 bytes depending
on the magnitude of the value. Nevertheless, assume that it can not
exceed 4 bytes for consistency.
Limited the upper bound of the validator with 2**31 - 1.
Added a unit test.
Closes-Bug: #1338479
Change-Id: Icefa2fc228e4255a022d586cab4590607953d1ee
3ca85460a1