Description of problem:

If a user with the same login exist the message says  "A resource with the ID "user1" already exists." It would be better to say " A user with login User1 already exists" because for permissions, the term resource is used in different context

 
[root@hp-dl380pgen8-02-vm-16 ~]# pulp-admin auth permission
Usage: pulp-admin [SUB_SECTION, ..] COMMAND
Description: manage granting, revoking and listing permissions for resources

Available Commands:
  grant  - grants resource permissions to given user or given role
  list   - lists permissions for a particular resource
  revoke - revokes resource permissions from given user or given role
[root@hp-dl380pgen8-02-vm-16 ~]# 


Version-Release number of selected component (if applicable):

[root@hp-dl380pgen8-02-vm-16 ~]# rpm -q pulp-server
pulp-server-2.2.0-0.26.beta.fc19.noarch

How reproducible:


Steps to Reproduce:
1. create a user
2. try to create the same user again
3.

Actual results:
[root@hp-dl380pgen8-02-vm-16 ~]# pulp-admin auth user create --login user1 --password redhat
A resource with the ID "user1" already exists.



Expected results:


Additional info: