SNMP should listen on mgmt IP configured via DHCP

[SuvarnaMeenakshi]

Description

Steps to reproduce the issue:

Currently snmpd starts to listen on mgmt ip and loopback IP present in config_db.
Changed to listen to specific IPs instead of any IP was made here: #15487
If mgmt ip is configured via DHCP, then MGMT_INTERFACE table will not contain mgmt ip and snmpd will only listen on Loopback IP. This can be issue on devices where DHCP / ZTP is used and require snmp rechability via mgmt ip.

To achieve this, we could have a new feature to update STATE_DB with the DHCP configured mgmt IP information.
Changes could be made in snmp so that snmp restarts upon update to mgmt IP in STATE_DB so that snmpd listens on mgmt ip configured via DHCP.
Relies on #16165 feature request to update STATE_DB with mgmt ip.

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