[PATCH ifupdown2] addons: addressvirtual: fixup macvlan device enslavements for vrfs

[PATCH ifupdown2] addons: addressvirtual: fixup macvlan device enslavements for vrfs

Ticket: CM-12988
Reviewed By: julien, nikhil, dsa
Testing Done: tested ifup and ifdown of vrf devices with address virtual
slaves

This patch fixes up macvlan device enslavements when vrf device
or vrf slave is brought down and up. address virtual macvlan
devices on vrf slaves need to enslaved to the vrf. This
patch checks and fixes up those vrf enslavements for the following
cases:
ifdown <vrf_device> && ifup <vrf_device>
ifdown <vrf_slave> && ifup <vrf_slave>

starting state:
------------
$ip -br link show
myvrf            UP  46:c6:44:db:37:60 <NOARP,MASTER,UP,LOWER_UP>
bridge.901@bridge UP 44:38:39:00:77:88 <UP,BROADCAST,MULTICAST,UP>
bridge-901-v0@bridge.901 UP 00:00:5e:00:01:81 <UP,BROADCAST,MULTICAST,UP>

$ifdown myvrf
$ip -br link show
bridge.901@bridge DOWN           44:38:39:00:77:88 <BROADCAST,MULTICAST>
bridge-901-v0@bridge.901 DOWN    00:00:5e:00:01:81 <BROADCAST,MULTICAST,M-DOWN>

before patch (macvlan device bridge-901-v0 did not come up:
----------------------------------------
$ifup myvrf
$ip -br link show
bridge.901@bridge UP 44:38:39:00:77:88 <UP,BROADCAST,MULTICAST,UP>
bridge-901-v0@bridge.901 DOWN  00:00:5e:00:01:81 <BROADCAST,MULTICAST>
myvrf            UP             ce:a6:e1:85:75:73 <NOARP,MASTER,UP,LOWER_UP>

after patch:
------------
$ifup myvrf
$ip -br link show
bridge.901@bridge UP 44:38:39:00:77:88 <UP,BROADCAST,MULTICAST,UP>
bridge-901-v0@bridge.901 UP 00:00:5e:00:01:81 <UP,BROADCAST,MULTICAST,UP>
myvrf                   UP     ce:a6:e1:85:75:73 <NOARP,MASTER,UP,LOWER_UP>

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>