Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/25796

Log:
commit b59c83de0340e6219dbb05a6e592a481637a3479
Author: Davanum Srinivas <dims at linux.vnet.ibm.com>
Date:   Tue May 14 21:24:55 2013 -0400

    Restrict StrOpt to just a few allowed values
    
    Allow the developers to specify allowed parameter with a list
    of values. Throw a ValueError when the value specified in
    the command line or config file is not in the list of allowed
    values
    
    Fixes LP# 1123043
    
    DocImpact
    
    Change-Id: I69f5610dd738f808c7f2734e8abead0e26f8dadf