block-storage refactor for Pike and Chef 13

- deprecated postgresql support
- dropped apt cookbook dependency
- deprecated node.foo.bar method access for node['foo']['bar'] bracket syntax
- implemented foodcritic and cookstyle corrections
- migrated cinder api to a Chef-managed config
- deprecated cinder-group-active service, as it is no longer needed and gets in
  the way of functionality
- added lvm cookbook dependency for better pv/vg handling

Implements blueprint modern-chef

Change-Id: Id248c9267af6750c871487bc8b577aa2011a782a

spec/volume_spec.rb

@@ -22,6 +22,10 @@ describe 'openstack-block-storage::volume' do
       expect(chef_run).to upgrade_package 'qemu-utils'
     end
 
+    it 'upgrades thin provisioning tools package' do
+      expect(chef_run).to upgrade_package 'thin-provisioning-tools'
+    end
+
     it 'starts cinder volume' do
       expect(chef_run).to start_service 'cinder-volume'
     end
@@ -38,13 +42,6 @@ describe 'openstack-block-storage::volume' do
       expect(chef_run).to upgrade_package 'python-mysqldb'
     end
 
-    it 'upgrades postgresql python packages if explicitly told' do
-      node.set['openstack']['db']['block-storage']['service_type'] = 'postgresql'
-
-      expect(chef_run).to upgrade_package 'python-psycopg2'
-      expect(chef_run).not_to upgrade_package 'python-mysqldb'
-    end
-
     it 'upgrades cinder iscsi package' do
       expect(chef_run).to upgrade_package 'tgt'
     end