c7583c fix(p_samba): mimic 'security = share' (deprecated) in the test config

Authored and Committed by bstinson 8 years ago
    fix(p_samba): mimic 'security = share' (deprecated) in the test config
    
    'security = share' was deprecated in previous versions and removed in
    the version shipped with CentOS 7-1511. We can mimic the same behavior with
    'security = user' and setting a 'map to guest' directive