Implement Cisco FRU Fan-Tray Status MIB

[levhuan]

Description
Implement support for Cisco FRU Fan-Tray Oper Status MIB OID 1.3.6.1.4.1.9.9.117.1.4.1 in SONiC subagent

Steps to reproduce the issue:

1. docker exec snmp snmpwalk -v2c -c public localhost 1.3.6.1.4.1.9.9.117.1.4.1

Describe the results you received:

iso.3.6.1.4.1.9.9.117.1.4.1 = No Such Object available on this agent at this OID

Describe the results you expected:
The snmp-subagent returns one entry for each of the fan-tray per https://mibs.observium.org/mib/CISCO-ENTITY-FRU-CONTROL-MIB/#cefcFanTrayOperStatus

Additional information you deem important (e.g. issue happens only occasionally):