use IP cmd to setup vlan_filter as a backup method #401
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What I did
use IP cmd to setup vlan_filter as a backup method
Why I did it
echo will fail in virtual switch since /sys directory is read-only.
need to use ip command to setup the vlan_filtering which is not available in debian 8.
Once we move sonic to debian 9, we can use IP command by default
How I verified it
build virtual switch and verified.
Details if related
Will generate an PR to add test for virtual switch. The test will be in another PR since we need to build the new virtual switch docker first.