Restrict the tests to only run against Chef 12.
Restrict the tests to only run against Chef 12.

Chef 12 doesn't have some of the new bootstrap_template flags.

offslinker/knife-windows,chef/knife-windows,RobbertJanSW/knife-windows,chef/knife-windows,RobbertJanSW/knife-windows,ClogenyTechnologies/knife-windows,offslinker/knife-windows,ClogenyTechnologies/knife-windows,mwrock/knife-windows,MsysTechnologiesllc/knife-windows,MsysTechnologiesllc/knife-windows,mwrock/knife-windows