codfw-prod: empty ms-be2013/2014/2015 sdm3/sdn3

we'll need to replace these with actual SSDs

RT #8804

Change-Id: I26c765571ea15622c23419969f43cefb2cd7b7b1
codfw-prod: put back weight on sdm/sdn for ms-be2013/14/15

Change-Id: If85762b840b6ebafc9dea7f4da3fc25f2ad71b75