Remove the force-replace test case from verify_dynamic_ring

There is a race condition that can cause the force-replace test case
in the verify_dynamic_ring test to fail. This issue is being tracked
by riak_core issue #570.  This changes replaces the force-replace
testing with another resize test. Once issue #570 is resolved this
change can be reverted.
Merge branch 'refactor/remove-dynammic-ring-force-replace'