d849108 backend: execute actions with sane umask=0022

Authored and Committed by praiskup 4 years ago
    backend: execute actions with sane umask=0022
    
    The DaemonContext for some reason uses insane umask=0 by default:
    https://www.python.org/dev/peps/pep-3143/
    
    Fixes: #1140
    Merges: #1144