Do not overwrite role in install phase

This causes an exception later:

 undefined method `[]' for nil:NilClass
 /opt/dell/crowbar_framework/app/models/provisioner_service.rb:158
Merge pull request #191 from VictorLowther/pull-req-release-pebbles-master-7c5257af784759eacfafa5f491c17946de7b8420

+2 Zap volume groups properly at hard drive wiping time. [1/1]
fix syntax error
Merge pull request #192 from dirkmueller/release/pebbles/master

fix syntax error
use admin IP to not depend on hostname
Do not include empty ProductKey entry

otherwise MS Hyper-V 2012 errors out
MS Windows syntax fix
MS Windows: use UTC timezone
Merge pull request #194 from SUSE-Cloud/hypervproductkey

Hyper-V fixes
Merge pull request #189 from dirkmueller/fix_role_exception

https://github.com/crowbar/barclamp-provisioner/pull/189

Merged by devtool for VictorLowther