Description of problem:
If you  run node bind on a repo that is already bound to the consumer, the repo will show up twice in the bindings

Version-Release number of selected component (if applicable):
[root@rhsm-jenkins ~]# rpm -qa pulp-server
pulp-server-2.5.2-0.3.beta.el6.noarch
[root@rhsm-jenkins ~]#

How reproducible:


Steps to Reproduce:
1.Create / Sync a repo on a node server and bind the repo to a consumer
2.Setup that consumer as the node child
3.Enable and publish that repo from step1 on the node
4. Use node bind to bind that repo to the node child
5. Run consumer list
6. Run node list

Actual results:
[root@rhsm-jenkins ~]# pulp-admin consumer list
+----------------------------------------------------------------------+
                               Consumers
+----------------------------------------------------------------------+

Id:            january
Display Name:  january
Description:   None
Bindings:      
  Confirmed:   rhel6, rhel6, drpm, drpm
  Unconfirmed: 
Notes:         


[root@rhsm-jenkins ~]# pulp-admin node list
+----------------------------------------------------------------------+
                              Child Nodes
+----------------------------------------------------------------------+

Id:               january
Display Name:     january
Description:      None
Bindings:         
  Additive: rhel6, rhel6, drpm, drpm
Update Strategy:  additive
Notes:            


[root@rhsm-jenkins ~]# 


Expected results:


Additional info: