setting the utf8 charset manually for mysql no longer required

this is now done by the db_uri library method in
openstack-common/libraries/endpoints.rb

Change-Id: I93c5ac383fb870eb1604cf68b200a564100663a3
upgrade to Havana release

also upgrade gems:
- berkshelf, ~> 2.0.10
- chefspec, ~> 3.0.2
- foodcritic, ~> 3.0.3

Change-Id: I732f73d02263e3257167898826dbb8d0f60a064d