[202012][VxLAN]VxLAN Tunnel Counters and Rates implementation #2442
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Backport of #1859
What I did
Implemented counters and rates for VxLAN.
Why I did it
To display vxlan counters and to enable counterpoll for tunnel counters.
How I verified it
Verified using vs tests
Details if related
Added a generic directory structure for flex counter manager. Currently tunnel counters are written for VxLAN but in future it might be expanded to other tunnels which might use the same flex counter infra.