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 
Actually, it fails miserably after only 1 second. Or 5 seconds. 

I get your point, but was just making sure the *client* wasn't the problem when fixing these, which is what I'm actually testing. IMHO it's a bit screwy that Riak replies that something is done when it actually isn't ... but that's just me. I'm actually contemplating changing the client to do the polling in the operation rather than the test so that it doesn't return until the index is actually created, as it's almost a guarantee to cause a user the same issue when they go to use it.