src/lib/dhcpsrv/pgsql_lease_mgr.cc
    PgSqlLease6Exchange::Uiaid - made this public and added function to
    return the int32 bit value as a string

    PgSqlLeaseMgr::getLeases6() - uses Uiaid.dbInputString() now

src/lib/dhcpsrv/tests/generic_lease_mgr_unittest.*
    GenericLeaseMgrTest::testLease6LargeIaidCheck() - new test to
    ensure large value iaids can be stored.

src/lib/dhcpsrv/tests/pgsql_lease_mgr_unittest.cc
    TEST_F(PgSqlLeaseMgrTest, leases6LargeIaidCheck) - new test

src/lib/dhcpsrv/tests/cql_lease_mgr_unittest.cc
    TEST_F(CqlLeaseMgrTest, lease6InvalidHostname) - new test

src/lib/dhcpsrv/tests/mysql_lease_mgr_unittest.cc
    TEST_F(MySqlLeaseMgrTest, leases6LargeIaidCheck) - new test