Change grizzly to juno for openstack cookbooks

All openstack occurences pointed to Grizzly instead of latest release of
Openstack (Juno). More, the ops-database cookbook now support Postgresql.
remove service and settings

not in Chef Server 12
remove all opscode-chef

from all versions
Merge pull request #425 from PierreRambaud/grizzly-to-juno

Change grizzly to juno for openstack cookbooks
version knife bootstrap configuration settings
fix paths
add topics
move context
add topics
add description; deprecate old settings
add topics
update paths
edits
update for 12
add setting
edits, hook in include topic
edit verify_api_cert description; apply changes
add section re: ssl changes for chef-client 12