MB-12251: Remove rebalance tests

The rebalance tests for the spatial views should be rewritten with
the new testrunner API. Hence I'm removing the old ones.

Change-Id: I7eeb54900b7d21e1dc27793829a097962e1a9947
Reviewed-on: http://review.couchbase.org/43852
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>