2356204 util: add function for looking up the user shell

Authored and Committed by berrange 7 years ago
    util: add function for looking up the user shell
    
    Add a virGetUserShell wrapper around virGetUserEnt, that
    returns the shell field.
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
    
        
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