/etc/apt/preferences is changed twice on every puppetrun on couch nodes (Feature #3962)

this will fix the alteration of the preferences file. we now use the
apt module default preferences, and pin the depending packages from
squeeze that are dependencies for the bigcouch package in the
couchdb module, class couchdb::bigcouch::package::cloudant.
updated submodule couchdb
Merge branch 'develop' of ssh://code.leap.se/leap_platform into develop