Add support for privileged option

Adds support for the `privileged` option in docker-compose.yml. This has
been supported in docker-compose since 0.4.0, so it seems reasonable to
add support here.

See https://docs.docker.com/compose/compose-file/#domainname-hostname-ipc-mac_address-privileged-read_only-shm_size-stdin_open-tty-user-working_dir

podman_compose.py

@@ -502,6 +502,8 @@ def container_to_args(compose, cnt, detached=True, podman_command='run'):
         podman_args.append('-i')
     if cnt.get('tty'):
         podman_args.append('--tty')
+    if cnt.get('privileged'):
+        podman_args.append('--privileged')
     ulimit = cnt.get('ulimits', [])
     if ulimit is not None:
         # ulimit can be a single value, i.e. ulimit: host