[checks] Add a check for too restrictive umask

If umask is set to something too high (>0022), a warning will be
printed. It does not abort the compose though.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

bin/pungi-koji

@@ -172,6 +172,7 @@ def main():
     import pungi.checks
     if not pungi.checks.check(conf):
         sys.exit(1)
+    pungi.checks.check_umask(logger)
 
     if opts.target_dir:
         compose_dir = Compose.get_compose_dir(opts.target_dir, conf, compose_type=compose_type, compose_label=opts.label)