IPaddr2 resource agent cannot handle LOWERLAYERDOWN status of a vlan device then ip resource doesn't failover to another node.

Issue

IPaddr2 resource agent cannot handle LOWERLAYERDOWN status of a vlan device.

The figure is

[VIP address: aaa.aaa.aaa.1] ----+                         +---- eth1
                                 +--- vlan10 ---- bond1 ---+
[IP address:  aaa.aaa.aaa.5] ----+                         +---- eth2

In this case, the user did ifdown of underlying physical interfaces(eth1, eth2).
While all slave interfaces are down, ip addr show returns as follows:

6: eth1: <BROADCAST,MULTICAST,SLAVE> mtu 9000 qdisc mq master bond1 state DOWN group default qlen 1000
    link/ether <snip> brd ff:ff:ff:ff:ff:ff
7: eth2: <BROADCAST,MULTICAST,SLAVE> mtu 9000 qdisc mq master bond1 state DOWN group default qlen 1000
    link/ether <snip> brd ff:ff:ff:ff:ff:ff
28: bond1: <NO-CARRIER,BROADCAST,MULTICAST,MASTER,UP> mtu 9000 qdisc noqueue state DOWN group default qlen 1000
    link/ether <snip> brd ff:ff:ff:ff:ff:ff
    inet6 <snip> scope link
       valid_lft forever preferred_lft forever
36: vlan10@bond1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 9000 qdisc noqueue state LOWERLAYERDOWN group default qlen 1000
    link/ether <snip> brd ff:ff:ff:ff:ff:ff
    inet aaa.aaa.aaa.1/24 brd aaa.aaa.aaa.254 scope global vlan10
       valid_lft forever preferred_lft forever
    inet aaa.aaa.aaa.5/32 brd aaa.aaa.aaa.5 scope global vlan10
       valid_lft forever preferred_lft forever
    inet6 <snip> scope link
       valid_lft forever preferred_lft forever

In this case, the VIP cannot communicate with other nodes. But, IPaddr2 resource agent cannot detect this state and pacemaker doesn't failover this IP resource to another node.