ifupdownaddons: LinkUtils: bridge vlan show: add support for new iproute2 format

ifupdownaddons: LinkUtils: bridge vlan show: add support for new iproute2 format

A newer iproute2 version changed the bridge vlan show output, ifupdown2 relies
on the previous format, we have the convert  data into old format:

{
   "vx-1002": [{
        "vlan": 1002,
        "flags": ["PVID", "Egress Untagged"]
    }],
    "vx-1004": [{
        "vlan": 1004,
        "flags": ["PVID", "Egress Untagged"]
    }]
 }

auto bridge
iface bridge
        bridge-vlan-aware yes
        bridge-ports vx-1000 vx-1001 vx-1002 vx-1003 vx-1004 hostbond3 hostbond4
        bridge-stp on
        bridge-vids 1000-1004
        bridge-pvid 1

auto vx-1002
iface vx-1002
        vxlan-id 1002
        bridge-access 1002
        vxlan-local-tunnelip 27.0.0.15
        bridge-learning off
        bridge-arp-nd-suppress on
        mstpctl-portbpdufilter yes
        mstpctl-bpduguard yes
        mtu 9152

auto hostbond4
iface hostbond4
        bond-slaves swp2 swp3
        bond-mode 802.3ad
        bond-min-links 1
        bond-lacp-rate 1
        mtu 9152
        alias Local Node/s TORS1 and Ports swp32s2 swp32s3 <==> Remote  Node/s HOSTS12 and Ports swp1 swp2
        bridge-pvid 1001

auto swp3
iface swp3
        link-speed 10000
        link-duplex full
        link-autoneg off

auto swp2
iface swp2
        link-speed 10000
        link-duplex full
        link-autoneg off

auto vx-1004
iface vx-1004
        vxlan-id 1004
        bridge-access 1004
        vxlan-local-tunnelip 27.0.0.15
        bridge-learning off
        bridge-arp-nd-suppress on
        mstpctl-portbpdufilter yes
        mstpctl-bpduguard yes
        mtu 9152

auto vx-1003
iface vx-1003
        vxlan-id 1003
        bridge-access 1003
        vxlan-local-tunnelip 27.0.0.15
        bridge-learning off
        bridge-arp-nd-suppress on
        mstpctl-portbpdufilter yes
        mstpctl-bpduguard yes
        mtu 9152

auto hostbond3
iface hostbond3
        bond-slaves swp5 swp6
        bond-mode 802.3ad
        bond-min-links 1
        bond-lacp-rate 1
        mtu 9152
        alias Local Node/s TORS1 and Ports swp32s0 swp32s1 <==> Remote  Node/s HOSTS11 and Ports swp1 swp2
        bridge-pvid 1000

auto swp6
iface swp6
        link-speed 10000
        link-duplex full
        link-autoneg off

auto swp5
iface swp5
        link-speed 10000
        link-duplex full
        link-autoneg off

auto vx-1001
iface vx-1001
        vxlan-id 1001
        bridge-access 1001
        vxlan-local-tunnelip 27.0.0.15
        bridge-learning off
        bridge-arp-nd-suppress on
        mstpctl-portbpdufilter yes
        mstpctl-bpduguard yes
        mtu 9152

auto vx-1000
iface vx-1000
        vxlan-id 1000
        bridge-access 1000
        vxlan-local-tunnelip 27.0.0.15
        bridge-learning off
        bridge-arp-nd-suppress on
        mstpctl-portbpdufilter yes
        mstpctl-bpduguard yes
        mtu 9152

Signed-off-by: Julien Fortin <julien@cumulusnetworks.com>