[COPP:Yang-changes] Fix for config replace issues seen with COPP configurations

[Verma-Anukul]

==> Issue:
config replace/yang-validation fails for COPP configurations.

==> Root cause:
• COPP's device initial config copp_cfg.json has missing yang mandatory leaf "trap_action" for "default" COPP_GROUP.
• "genetlink_name" & "genetlink_mcgrp_name" nodes are not added in sonic-copp.yang, which are used for "queue2_group1" in copp_cfg.json

==> Fix:
• In copp_cfg.json, mandatory leaf "trap_action" is added for "default" COPP_GROUP.

"COPP_GROUP": {
"default": {

• "trap_action":"trap", <<< this node needs to be added
  "queue": "0",
  "meter_type":"packets",

• "genetlink_name" and "genetlink_mcgrp_name" leaves are added in sonic-copp.yang.

• DB Migration script is updated to upgrade the DB config automatically.

==> Tests :
Config replace ->
i. Config load copp_cfg.json
ii. Config save
iii. Config replace -> Ensure no error seen

Upgrade ->
i. Save config in build without the fix
ii. upgrade to build with changes and ensure configurations are reflected in new config_db.json

==> PRs :
Sonic-buildimage : sonic-net/sonic-buildimage#19817
Sonic-utilities : #3473
SONiC (docs) : sonic-net/SONiC#1773

Signed-off-by: Anukul Verma [email protected]