Remove more excess Service provider => upstarts

puppet knows to do the right thing these days, do not depend on upstart
unnecessarily. Remove from apertium, mongodb, nutcracker, statsd that
upon inspection seem to be the only ones left that use it without
providing their own service files.

Change-Id: Ib4e9fd444604c4765789004a5a5618e213cb3a44
webserver: add || debian >= jessie to os_version

Change-Id: Ibd0067a4ea45e4e98c43d7366a6546d8f1271c88