orchestrator: Log exception to log file

This data can be useful for debugging.

JIRA: COMPOSE-3284
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

pungi_utils/orchestrator.py

@@ -544,5 +544,9 @@ def main(argv=None):
     main_config_file = os.path.abspath(args.config)
 
     with temp_dir() as work_dir:
+        try:
             if not run(work_dir, main_config_file, args):
                 sys.exit(1)
+        except Exception:
+            log.exception("Unhandled exception!")
+            sys.exit(1)