Move user definitions to databags.
Fixup node json definitions for user refactor.
Merge pull request #41 from stevendanna/user-refactor-wip

Move user definitions to databags.
cleanup nodes
- users/sudo are in base role
- ntp is in base role
- memcached is not on lb
- new_relic is in monitoring role
- openssh is in base role
- dns is in base role
- vagrant role