- start interface <interface_name> when the kernel detects
a hotplug event from the interface

ref: https://www.debian.org/doc/manuals/debian-reference/ch05.en.html

Signed-off-by: Shuotian Cheng <[email protected]>

… allow-hotplug

1. Remove vlan_interfaces and lag_interfaces file and members in teamd.j2
2. Add all interfaces to /etc/network/interfaces file
3. Add allow-hotplug stanza
4. Add up <command> to automatically add interfaces to VLAN and LAG
5. Add unique_name filter to minigraph.py to remove duplicate interface names
6. Add brctl to base image
7. Update sonic-swss submodule

Signed-off-by: Shuotian Cheng <[email protected]>