add second ssh key for Yuvi

RT #6531

We know Yuvi, he, rightfully, because i was on duty, pinged me on
IRC. I had him confirm by pasting on Office wiki. link below:

https://office.wikimedia.org/w/index.php?title=User:Ypandian&oldid=103719

he has a new machine with a new key, which is reasoable to me

he wasn't immediately blocked from work but it would still be good
if it can be merged soon. actually i said I'd already handle it
a couple hours ago, but busy here in the last week before holidays

my rule i follow here right now is that if the topic branch is
"access" (which i made up) or security i don't merge without at least
one +1 from another ops, but let's not be bureaucrats and let him
wait long. please do the needful

Change-Id: I6fd9018fae29cfa3e10a916432cb66cb9811684f