rgw_sal_motr : [CORTX-32387] Fix null version-id issues in GET/HEAD object API

[priyanka25081999]

Problem Statement:
GET and HEAD object with null version-id does not contain "VersionId" field in the response

Solution:
In GET/HEAD object with --version-id null parameter for simple and multipart object, set the ent.key.instance value as null to show the VersionId field in the response.

Signed-off-by: Priyanka Salunke [email protected]

Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
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• Component impact
  • Affects Dashboard, opened tracker ticket
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• Tests (select at least one)
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  • No tests

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[priyanka25081999]

• Tested the 1N k8s manual deployment - https://eos-jenkins.colo.seagate.com/job/Cortx-Automation/job/RGW/job/setup-cortx-rgw-cluster/10468/
• Sanity test - https://eos-jenkins.colo.seagate.com/job/Cortx-Automation/job/S3Server/job/S3-Compatibility-Test-Ceph-RGW/180/
• Added test logs in the JIRA - https://jts.seagate.com/secure/attachment/530320/530320_MGW+logs+-+CORTX-32387.txt