Cleaned up keystone-all --help output

- Added a missing space: mayuse -> may use
- Removed default values from help messages, which were appearing as
  None, and should be added by argparse anyway
- Updated man pages

Change-Id: I471a1aaff40398488e19f91a16bd91d2d17db61d
add missing kvs functionality (bug1119770)

add list_projects
mod list_groups, list_domains, get_project_users to match sql response
not adding list_user_projects

fix list_projects to return refs
drop get_projects and get_all_projects

Change-Id: Ifa1433918b8770cd7d59f36f71f2e6b935625ae5
Merge "Cleaned up keystone-all --help output"
Merge "add missing kvs functionality (bug1119770)"