Support version 2.1.1 changes

[PrathibaJee]

To completely implement the version 2.1.1 changes , the following tasks and their subtasks needs to be completed. All the tasks needs to be implemented , tested , reviewed and merged to the v2.1.1_impl branch.

• [x] https://github.com/openBackhaul/RegistryOffice/issues/551
• [x] To support Version 2.1.1 changes for /v1/register-application - No changes required (note : as per the issue#535 update to the request body is reverted). Make a @deprecated tag to this function both in the controller and services modules.
• [x] https://github.com/openBackhaul/RegistryOffice/issues/552
• [x] https://github.com/openBackhaul/RegistryOffice/issues/553
• [x] https://github.com/openBackhaul/RegistryOffice/issues/554
• [x] https://github.com/openBackhaul/RegistryOffice/issues/555
• [x] https://github.com/openBackhaul/RegistryOffice/issues/556

The following APIs have no logical changes required. A regression test needs to be performed to ensure the proper functioning of the services,

• [x] /v1/list-applications
• [x] /v1/list-applications-in-generic-representation
• [x] /v1/inquire-application-type-approvals
• [x] /v1/notify-deregistrations
• [x] /v1/notify-approvals
• [x] /v1/notify-withdrawn-approvals
• [x] /v1/relay-server-replacement
• [x] /v1/relay-operation-update