adding bastion role and task to setup access to the dbs from it
adding dependency for the user role so that bastion users are installed
renaming user_info to USER_INFO
force set to yes for key file update
changing USER_INFO to user_info
more changes to support user_info
Merge pull request #852 from edx/jarv/add-bastion-db-access

adding bastion role and task to setup access to the dbs from it