[Submodule update] sonic-snmpagent

 Update transceiver info DB key names (#146)
[Multiasic]: Provide namespace support for ipNetToMediaPhysAddress (#129)
[LLDP]: Modify OID index of LLDPRemTableUpdater MIB (#155)
[Namespace]: Simplify sync_d functions to use higher order (#154)
[Namespace]: Fix interface counters in RFC 1213 (#145)

Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>