Upgrade default platform CI build to jessie
and create a new singlenode one for wheezy
(from redmine: created on 2016-01-13, closed on 2016-01-19, relates #7683 (closed))
and create a new singlenode one for wheezy
(from redmine: created on 2016-01-13, closed on 2016-01-19, relates #7683 (closed))