OCG-raise monitor threshold for output file size

we had monitoring events like:

<+icinga-wm> PROBLEM - OCG health on ocg1001 is CRITICAL: CRITICAL:
/mnt/tmpfs 0B: /srv/deployment/ocg/output 5.5GB (= 5.0GB critical):

for output file dir being over 5G, but why did we do this when
we have over 450G of space on /src ?

i guess it existed before a new disk was added

raising warning to 40G and critical to 50G for now,
adding cscott as well

Change-Id: I4d38e695a1aa946e68d8b246d32b43f049f60da4