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Description of problem:
For an HBAC rule, you can choose to add a Host in "Accessing" section. Then do a find, find it, and add it again to the list of prospective members. It will throw an error when finally clicking on Enroll...but it shouldn't allow to find the host for available list, when it is already in prospective list. 
Same behaviour seen in other areas where adder dialog used.

Version-Release number of selected component (if applicable):
ipa-server-2.1.1-4.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. Add and edit HBAC rule
2. Go to its Accessing section, and click to Add a Host
3. checkbox a host (previously added), and click on >>
4. In the 'Find' field, search for this host, and it will be listed in Available section
5. Choose it, and click on 'Enroll' again
 
  
Actual results:
This can go on, and same host can be added multiple times to the list.
Click on 'Enroll' and error is thrown, but this host does get enrolled  - once.

Expected results:
A host in Prospective list should not be 'found' in Available list


Additional info:

Upstream ticket:
https://fedorahosted.org/freeipa/ticket/1859

Fixed upstream:

master: a2a42c3be8e7a0fb591af14b3da298b5ae35b6ac
ipa-2-1: df16d4aff73f95d3cdac4f0d3504e4c73e936789

Verified using ipa-server-2.1.2-2.el6.x86_64
Doign a find for an object already enrolled, does not list it in 'Available' column. So it cannot be enrolled multiple times anymore

This part of Enroll dialog behavior was reworked post-6.1, thus not entirely applicable as 6.1 bug.

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Do not document

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2011-1533.html