[sonic-snmpagent][sonic-py-swsssdk] Update submodules

[jleveque]

• src/sonic-snmpagent 89b7b2c...c702a57 (7):

  Revert "[rfc1213] Interface MIB add l3 vlan interfaces & aggregate rif counters (latest sx-kernel package is missing #133)" (Fix the redis.conf file for sonic p4 image #151)
  Update transceiver info DB key names (Add redis in sonic p4 image #146)
  Fix LGTM reported alert of PR#141 (Update Mellanox SAI and SDK version. Add SDK installation dependencies. #142)
  [Namespace] Fix interfaces counters in InterfacesMIB RFC 2863 (Add .gitignore for Mellanox platform #141)
  [Namespace]: Fix SNMP AgentX socket connection timeout when using Namespace.get_all() (Update .gitignore #140)
  [rfc1213] Interface MIB add l3 vlan interfaces & aggregate rif counters (latest sx-kernel package is missing #133)
  Fix undefined variable and warning message (docker-fpm and docker-team depend on libsai #134)

• src/sonic-py-swsssdk a83366e...2df4f40 (3):

  Allowing TCP connections with namespace as well. (Install lldpd Build-Depends #81)
  [port_util] add get_rif_port_map, get_vlan_interface_oid_map (Refine installation order of mlnx-sdk debs #78)
  Updates to the namespace API's for test_moduleLoad.py (update sonic-linux-kernel #77)

Note that sonic-snmpagent submodule update is dependent upon sonic-py-swsssdk update, so updating both submodules in this PR.

[jleveque]

Retest vsimage please

[jleveque]

Retest vsimage please