1. Create ifindex_team, because TEAM_ATTR_TEAM_IFINDEX must
always point to a team device.
2. Remove output only attributes like team_attr_item_port, TEAM_ATTR_LIST_PORT,
TEAM_ATTR_OPTION_CHANGED.
3. Restructure team_nl_option_policy: we always want TEAM_ATTR_OPTION_NAME/TYPE/DATA
+ optionally TEAM_ATTR_OPTION_ARRAY_INDEX and TEAM_ATTR_OPTION_PORT_IFINDEX.
4. Provide specialized team_nl_option_policy_per_port and team_nl_option_policy_array.
5. Make team_attr_option varlen.
6. Remove unnecessary indirection via team_attr_list_option/team_attr_list_port.
7. Fix data type for bpf_hash_func and lb_tx_hash_to_port_mapping.
