Update minigraph.py to parse kubernetes config from minigraph.xml

[renukamanavalan]

- Why I did it
To make the kubernetes server IP & enabled/disabled status configurable through minigraph.
Saved cluster name into "DEVICE_METADATA|localhost" , so this can be available for kubernetes use.

- How I did it
Updated the parser (minigraph.py) to get it from MetadataDeclaration/Devices/DeviceMetadata section for this device.
Add to "DEVICE_METADATA|localhost" , if ClusterName is available in PngDec/Devices/Device for localhost

- How to verify it
Unit test is added to parse & test out.
For manual test add the following to MetadataDeclaration/Devices/DeviceMetadata section. call "config load_minigraph" and verify through "show kube server config"

Look for "DEVICE_METADATA": { "localhost": { ... "cluster": "<this device cluster name", ...}}, if minigraph.xml does carry it in JSON dump or /etc/sonic/config_db.json

<a:DeviceProperty>
<a:Name>KubernetesEnabled</a:Name>
<a:Reference i:nil="true"/>
<a:Value>0</a:Value>
</a:DeviceProperty>
<a:DeviceProperty>
<a:Name>KubernetesServerIp</a:Name>
<a:Reference i:nil="true"/>
<a:Value>10.10.10.10</a:Value>
</a:DeviceProperty>

- Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[qiluo-msft]

Remove extra blank lines #Closed

---

Refers to: src/sonic-config-engine/tests/test_minigraph_case.py:300 in bab6ca0. [](commit_id = bab6ca0, deletion_comment = False)

[renukamanavalan]

Remove extra blank lines

Refers to: src/sonic-config-engine/tests/test_minigraph_case.py:300 in bab6ca0. [](commit_id = bab6ca0, deletion_comment = False)

Can you please tell mem which file & line number ?
If it is last line in tests/test_minigraph_case.py, I have removed it.

[qiluo-msft]

Minor format issue. Otherwise lgtm.