[vlanmgrd] interface is not removed from default dot1q bridge when executing "config vlan member del 1000 Ethernet100"

[stepanblyschak]

From vlanmgr.cpp:

// The command should be generated as:
// /bin/bash -c '/sbin/bridge vlan del vid {{vlan_id}} dev {{port_alias}} &&
//               ( /sbin/bridge vlan show dev {{port_alias}} | /bin/grep -q None;
//               ret=$?; if [ $ret -eq 0 ]; then
//               /sbin/ip link set {{port_alias}} nomaster;
//               elif [ $ret -eq 1 ]; then exit 0;
//               else exit $ret; fi )'

Configuration: all ports in Vlan 1000

Execute:
admin@sonic:~$ sudo config vlan member del 1000 Ethernet124

Check output of the following command:

root@sonic:/# bridge vlan show dev Ethernet124
port    vlan ids

root@sonic:/# bridge vlan show dev Ethernet124 | grep -q None ; echo $?
1

Since return code is 1 the script decides not to remove interface from default dot1q bridge as there are other vlans configured, but they are not.

Expected behaviour:

If port was member of single vlan then remove it from default dot1q bridge.