bridge: Remove vlan listing from `bridge link`

bridge: Remove vlan listing from `bridge link`

vlan listing from `bridge link -d` was broken by commit f32e4977dcb0 ("bridge:
add json support for link command"). print_vlan_info() expects to be passed a
IFLA_AF_SPEC attribute (as is done in print_vlan()) but that commit changed
the call in link.c to pass a IFLA_BRIDGE_VLAN_INFO attribute instead. As a
result, a struct bridge_vlan_info is mistakenly parsed as a struct rtattr and
print_vlan_info() usually exits early in this callpath.

The output style of print_vlan_info() (one line per vlan) is different from
the output style of `bridge link` (multiple attributes per line). The json
output is also unsuitable for `bridge link`. Since vlan listing is available
from `bridge vlan`, remove it from `bridge link` instead of trying to change
print_vlan_info().

Note that previously, bridge master devices would be included in the output
when specifying '-d' (and only in that case) but they are no longer
included because there is no detailed information to show for master
devices if we are not printing a vlan listing:
$ bridge link
4: vxlan0: <BROADCAST,MULTICAST> mtu 1500 master br0 state disabled priority 32 cost 100
$ bridge -d link
3: br0: <BROADCAST,MULTICAST> mtu 1500 master br0
4: vxlan0: <BROADCAST,MULTICAST> mtu 1500 master br0 state disabled priority 32 cost 100
    hairpin off guard off root_block off fastleave off learning on flood on mcast_flood on mcast_to_unicast off neigh_suppress off vlan_tunnel on isolated off
$ ./bridge/bridge -d link
4: vxlan0: <BROADCAST,MULTICAST> mtu 1500 master br0 state disabled priority 32 cost 100
    hairpin off guard off root_block off fastleave off learning on flood on mcast_flood on mcast_to_unicast off neigh_suppress off vlan_tunnel on isolated off

Fixes: f32e4977dcb0 ("bridge: add json support for link command")
Signed-off-by: Benjamin Poirier <bpoirier@nvidia.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>