bridge: add 'bridge_options" new 1.25+ test
Check that NM can set all of the following bridge options::
- ageing_time
- forward_delay
- group_addr
- group_fwd_mask
- hello_time
- max_age
- multicast_last_member_count
- multicast_last_member_interval
- multicast_membership_interval
- multicast_mld_version
- multicast_querier
- multicast_querier_interval
- multicast_query_interval
- multicast_query_response_interval
- multicast_query_use_ifaddr
- multicast_router
- multicast_snooping
- multicast_startup_query_count
- multicast_startup_query_interval