Make sure bridge-utils and vlan get installed by default.
Merge pull request #122 from VictorLowther/pull-req-release-pebbles-master-57b4821d276e5da97e9a031ecb6ab6c94f74ce80

https://github.com/crowbar/barclamp-provisioner/pull/122

Merged by devtool for VictorLowther