Removed chefdk conditional from bootstrap.sh
Removed chefdk conditional from bootstrap.sh

- the usefulness of the bootstrap.sh script is superseded by ansible playbooks.
  don't attempt to install chefdk a second time.

Change-Id: Ie16c40ce5e443a684cc6969dbbeaf3c3a64f01b5

openstack/cookbook-openstack-common,openstack/cookbook-openstack-common