Add Multi ASIC support for apply-patch

[xincunli-sonic]

What I did

Add Multi-ASIC GCU support apply-patch.

How I did it

1. Categorize configuration as JSON patch format per ASIC.
2. Apply patch per ASIC, including localhost.

How to verify it

admin@str3-7800-lc3-1:~/gcu$ cat jsonpatch.json 

[
    {
        "op": "add",
        "path": "/asic0/PORTCHANNEL/PortChannel108/admin_status",
        "value": "down"
    },
    {
        "op": "replace",
        "path": "/localhost/BGP_DEVICE_GLOBAL/STATE/tsa_enabled",
        "value": "true"
    },
    {
        "op": "replace",
        "path": "/asic0/BGP_DEVICE_GLOBAL/STATE/tsa_enabled",
        "value": "true"
    },
    {
        "op": "replace",
        "path": "/asic1/BGP_DEVICE_GLOBAL/STATE/tsa_enabled",
        "value": "true"
    }
]

admin@str3-7800-lc3-1:~/gcu$ sudo config apply-patch jsonpatch.json 
Patch: [{"op": "add", "path": "/asic0/PORTCHANNEL/PortChannel108/admin_status", "value": "down"}, {"op": "replace", "path": "/localhost/BGP_DEVICE_GLOBAL/STATE/tsa_enabled", "value": "true"}, {"op": "replace", "path": "/asic0/BGP_DEVICE_GLOBAL/STATE/tsa_enabled", "value": "true"}, {"op": "replace", "path": "/asic1/BGP_DEVICE_GLOBAL/STATE/tsa_enabled", "value": "true"}]
('asic0', [{'op': 'add', 'path': '/PORTCHANNEL/PortChannel108/admin_status', 'value': 'down'}, {'op': 'replace', 'path': '/BGP_DEVICE_GLOBAL/STATE/tsa_enabled', 'value': 'true'}])
NameSpace: asic0
generic_update_factory: <generic_config_updater.generic_updater.GenericUpdateFactory object at 0x7f61ae2a18e0>
generic_update_factory: <generic_config_updater.generic_updater.GenericUpdateFactory object at 0x7f61ae2a18e0>
Patch Applier: asic0: Patch application starting.
Patch Applier: asic0: Patch: [{"op": "add", "path": "/PORTCHANNEL/PortChannel108/admin_status", "value": "down"}, {"op": "replace", "path": "/BGP_DEVICE_GLOBAL/STATE/tsa_enabled", "value": "true"}]
Patch Applier: Getting current config db.
Patch Applier: Simulating the target full config after applying the patch.
Patch Applier: Validating all JsonPatch operations are permitted on the specified fields
Patch Applier: Validating target config does not have empty tables, since they do not show up in ConfigDb.
Patch Applier: Sorting patch updates.
<class 'generic_config_updater.patch_sorter.StrictPatchSorter'>
Patch Applier: The patch was sorted into 0 changes.
Patch Applier: Applying 0 changes in order.
Patch Applier: Verifying patch updates are reflected on ConfigDB.
Patch Applier: Patch application completed.
('localhost', [{'op': 'replace', 'path': '/BGP_DEVICE_GLOBAL/STATE/tsa_enabled', 'value': 'true'}])
NameSpace: 
generic_update_factory: <generic_config_updater.generic_updater.GenericUpdateFactory object at 0x7f61b1b547c0>
generic_update_factory: <generic_config_updater.generic_updater.GenericUpdateFactory object at 0x7f61b1b547c0>
Patch Applier: : Patch application starting.
Patch Applier: : Patch: [{"op": "replace", "path": "/BGP_DEVICE_GLOBAL/STATE/tsa_enabled", "value": "true"}]
Patch Applier: Getting current config db.
Patch Applier: Simulating the target full config after applying the patch.
Patch Applier: Validating all JsonPatch operations are permitted on the specified fields
Patch Applier: Validating target config does not have empty tables, since they do not show up in ConfigDb.
Patch Applier: Sorting patch updates.
<class 'generic_config_updater.patch_sorter.StrictPatchSorter'>
Patch Applier: The patch was sorted into 0 changes.
Patch Applier: Applying 0 changes in order.
Patch Applier: Verifying patch updates are reflected on ConfigDB.
Patch Applier: Patch application completed.
('asic1', [{'op': 'replace', 'path': '/BGP_DEVICE_GLOBAL/STATE/tsa_enabled', 'value': 'true'}])
NameSpace: asic1
generic_update_factory: <generic_config_updater.generic_updater.GenericUpdateFactory object at 0x7f61b1b547c0>
generic_update_factory: <generic_config_updater.generic_updater.GenericUpdateFactory object at 0x7f61b1b547c0>
Patch Applier: asic1: Patch application starting.
Patch Applier: asic1: Patch: [{"op": "replace", "path": "/BGP_DEVICE_GLOBAL/STATE/tsa_enabled", "value": "true"}]
Patch Applier: Getting current config db.
Patch Applier: Simulating the target full config after applying the patch.
Patch Applier: Validating all JsonPatch operations are permitted on the specified fields
Patch Applier: Validating target config does not have empty tables, since they do not show up in ConfigDb.
Patch Applier: Sorting patch updates.
<class 'generic_config_updater.patch_sorter.StrictPatchSorter'>
Patch Applier: The patch was sorted into 0 changes.
Patch Applier: Applying 0 changes in order.
Patch Applier: Verifying patch updates are reflected on ConfigDB.
Patch Applier: Patch application completed.
Patch applied successfully.

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)

[VladimirKuk]

What happens if "path" not in change? #Resolved

[xincunli-sonic]

According to RFC: https://www.rfc-editor.org/rfc/rfc6902#section-4, operation objects MUST have exactly one "path" member.

[VladimirKuk]

What happens if "db" not in ctx.obj? #Resolved

[wen587]

Do we support HLD #### 3.2.3.5 Checkpoints and Rollbacks in this PR? Or you want to propose another PR?

[xincunli-sonic]

Do we support HLD #### 3.2.3.5 Checkpoints and Rollbacks in this PR? Or you want to propose another PR?

Yes, it will be in another further pr to address the HLD mentioned checkpoint and rollback part.