jenkins: remove java6
jenkins: remove java6

sadeghim/ala-install,AtlasOfLivingAustralia/ala-install,sadeghim/ala-install,sadeghim/ala-install,AtlasOfLivingAustralia/ala-install,djtfmartin/ala-install,djtfmartin/ala-install,djtfmartin/ala-install,sadeghim/ala-install,AtlasOfLivingAustralia/ala-install,AtlasOfLivingAustralia/ala-install,AtlasOfLivingAustralia/ala-install,djtfmartin/ala-install