dot3 SNMP counters as per RFC3635

dot3 statistics are used for monitoring and debugging and are common
among switch vendors to have implemented.  This commit implements
the dot3StatsTable and dot3HCStatsTable.  Based on the code in
rfc1213.py and rfc2863.py.

Signed-off-by: Brad House <bhouse@nexthop.ai>

Author: bhouse-nexthop

src/sonic_ax_impl/main.py

@@ -11,7 +11,7 @@
 import ax_interface
 from sonic_ax_impl.mibs import ieee802_1ab, Namespace
 from . import logger
-from .mibs.ietf import rfc1213, rfc2737, rfc2863, rfc3433, rfc4292, rfc4363
+from .mibs.ietf import rfc1213, rfc2737, rfc2863, rfc3433, rfc3635, rfc4292, rfc4363
 from .mibs.vendor import dell, cisco
 
 # Background task update frequency ( in seconds )
@@ -27,6 +27,7 @@ class SonicMIB(
     rfc1213.SysNameMIB,
     rfc2737.PhysicalTableMIB,
     rfc3433.PhysicalSensorTableMIB,
+    rfc3635.etherMIBObjects,
     rfc2863.InterfaceMIBObjects,
     rfc4363.QBridgeMIBObjects,
     rfc4292.IpCidrRouteTable,