[N1QL RBAC] User with query_insert permission on a bucket allowed to create and drop primary index on that bucket.

1. create a bucket default with no documents.
2. create a user test with password as <<password>> with permission as query_insert on bucket default from UI.
3. Try the following query with login as test/password:

cbq> [root@localhost bin]# ./cbq -u test -p password
Connected to : http://localhost:8091/. Type Ctrl-D or \QUIT to exit.

Path to history file for the shell : /root/.cbq_history
cbq> create primary index on default;
{
"requestID": "315fadd3-19b7-4683-af1a-3de485e10233",
"signature": null,
"results": [
],
"status": "success",
"metrics":

{ "elapsedTime": "4.45581643s", "executionTime": "4.455784608s", "resultCount": 0, "resultSize": 0 }

}

cbq> drop primary index on default;
{
"requestID": "ac17f772-e62b-4014-982f-0e3ae8c0ca71",
"signature": null,
"results": [
],
"status": "success",
"metrics":

{ "elapsedTime": "2.003599927s", "executionTime": "2.003527412s", "resultCount": 0, "resultSize": 0 }

}

User test is allowed to create and drop primary index.