On recreating a CB bucket with same name, its connection with cbas broke.

Steps to Reproduce:
1. Create a cb bucket
2. Create a cbas bucket
3. Create a dataset
4. Connect to cbas bucket
5. Verify count on dataset
6. Delete the cb bucket
7. Verify count on dataset must remain unchange
8. Recreate the cb bucket
9. Verify count on dataset must be 0 ====> this is in Vulcan but in Alice as the bucket is disconnected there is no change in the count.

Test Script:

/opt/jython/bin/jython -J-cp Couchbase-Java-Client-2.5.6/*:jsch-0.1.54.jar:doc_ops.jar testrunner.py -i ${ini_file} -t cbas.cbas_backlog_ingestion.BucketOperations.test_delete_cb_bucket_with_cbas_connected,default_bucket=True,cb_bucket_name=default,cbas_bucket_name=default_cbas,dataset_name=ds,items=10000,GROUP=G1

NOTE
Marking it as regression if this is not the expected behavior for Alice.