Add basic functionality for writing ACLs with user and group permissions
to a file.
Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
Map input ACLs for setfacl with expected pyacl output to allow for
an easily expandable test matrix.
Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>