Fix yz tests

This fixes  the YZ integration tests that were failing by adding new pauses.

The behavior of YZ has slightly changed, apparently, where now setting bucket props immediately after creating an index will fail telling you the index doesn't exist. Pausing for 10 seconds seems to do the trick.

This can be tested via:

`mvn clean install -Pitest,default -Dcom.basho.riak.yokozuna=true -Dcom.basho,riak.buckettype=true`

With search enabled and the `test_type` bucket type created and activated. 

fixes #422