stop-gap prevention of ring resizing for unsupported applications

* see comment in riak_core_claimant on why this is a hack
* search will not, intially, be supported
* control may break as ring status evolves to provide more observability during
  the operation. failures would be transient but its easier to require disabling
  it then requiring it not be accessed during the operation. In the future, control
  will be aware of the operation and this can be dropped altogether