Adding snmp changes to pick up correct mgmt speed#359

rsh2prasad wants to merge 2 commits intosonic-net:mastersonic-net/sonic-snmpagent:masterfrom

rsh2prasad:rsh2prasad/mgmt_port_speed_state_dbrsh2prasad/sonic-snmpagent:rsh2prasad/mgmt_port_speed_state_dbCopy head branch name to clipboard