Add set, show, describe,handoff cmds to riak-admin

These are handled via the new riak_cli code that is currently being
integrated into riak_core.
Add riak_cli to reltool.config
Add new cluster commands to riak-admin

Depends on basho/riak_core#659
change riak_cli to clique
Merge pull request #654 from basho/rename-riak-cli-to-clique

change riak_cli to clique
Add handoff; remove cluster members
Merge pull request #655 from basho/cleanup/mra/riak-admin

Add handoff; remove cluster members
Add set, show and describe to usage
Merge pull request #656 from basho/cleanup/mra/set-show-describe

Add set, show and describe to usage
Merge pull request #657 from basho/integration/riak-admin-handoff-team

Integration/riak admin handoff team