Upgrade MDS switches MTWDC1FABB, MTWDC2FABB, and DRTFABB from 9.3(2) to 9.3(2a)

CHG0072451 Upgrade MDS switches MTWDC1FABB, MTWDC2FABB, and DRTFABB from 9.3(2) to 9.3(2a)