stats.wm.org: use ssl_ciphersuite

to make it use our global list of ciphers
we are setting in
/modules/wmflib/lib/puppet/parser/functions/
/ssl_ciphersuite.rb

looks like all other services that have an
SSL config already switched over except this one

Change-Id: I95196a0759b9bb368bfceef10d8c0821bd1ff622
Merge "stats.wm.org: use ssl_ciphersuite" into production