Upsert does not work with users in LDAP Group with admin role

1. Configure CB Server with LDAP authentication
2. Create a ldap group and add a user to the the group in ldap. 
3. Add ldap group to CBServer. Create a bucket in CB Server
4. Grant the ldap a 'admin' role

Now connect via SDK and create a document, failed with 

Traceback (most recent call last):

  File "test.py", line 9, in <module>

    cb.upsert('u:king_arthur6', {'name': 'Arthur', 'email': 'kingarthur@couchbase.com', 'interests': ['Holy Grail', 'African Swallows']})

  File "/Library/Python/2.7/site-packages/couchbase/bucket.py", line 406, in upsert

    replicate_to=replicate_to)

couchbase.exceptions.LCB_0x54 (generated, catch: CouchbaseInputError): <Key=u'u:king_arthur6', RC=0x54[Not authorized for operation], Operational Error, Results=1, C Source=(src/multiresult.c,316), Context=Authorization failure: can't execute SET operation without the Upsert privilege, Ref=4f12397c-d33f-4017-2e14-a54970557256>

• Note that the user has admin role from ldap group
• Note that internal user with admin is able to upsert
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