[yang][dhcp_server] Add dhcp_server_ipv4 yang model #16327
Merged
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Why I did it
#15955 import sonic-vlan in yang model, which would cause YANG backlink issue. So #15955 was reverted by #16322.
This PR is re-submitted of #15955 without import sonic-vlan.
Add yang model for IPv4 DHCP Server.
Work item tracking
How I did it
Add yang model for IPv4 DHCP Server.
Add four new tables: DHCP_SERVER_IPV4, DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS, DHCP_SERVER_IPV4_RANGE, DHCP_SERVER_IPV4_PORT.
Add related unit test.
HLD: https://github.com/yaqiangz/SONiC/blob/master_dhcp_server_hld/doc/dhcp_server/port_based_dhcp_server_high_level_design.md#rev-01
How to verify it
Build sonic_yang_models packages.
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)