CBSE-351: Wait for a while before querying bucket status

Sometimes bucket is not fully created yet. So "Object Not Found"
message can be returned if querying bucket status right away.

Change-Id: Ic84068de6bb111484ea8f7c4507985bb5afd9c4b
Reviewed-on: http://review.couchbase.org/24214
Tested-by: Bin Cui <bin.cui@gmail.com>
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Reviewed-on: http://review.couchbase.org/24326
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Bin Cui <bin.cui@gmail.com>