ipa-sam: update sid_to_id() interface to follow passdb API changes in Samba
    
    Commit a6e29f23f09ba5b6b6d362f7683ae8088bc0ba85 in Samba changed id mapping
    API in passdb interface to use 'struct unixid'. The change replaced three arguments
    (uid, gid, type) by one (struct unixid). As result, ipa-sam became broken.
    
    Without this change ipa-sam introduces stack corruption in Samba post 4.0.0alpha18
    leading to corrupted security context stack as well and then crashing in setgroups(3).