Fix error updating request_processing_data

Fix error updating request_processing_data

Fix error when updating existing record in request_processing_data
table.
Use correct field name in the toString method in RequestProcessingData
bean class.
RequestDbClient.updateRequestProcessingData should include entity id in
the URI on the PUT request.
Add new Config class ExposeEntityIdResourceConfiguration to make
Spring data Rest return id in the response for RequestProcessingData.
Make spring-boot-starter-data-rest not optional dependency in
mso-requests-db-repositories
Added unit test for RequestDbClient.updateRequestProcessingData()
method.

Issue-ID: SO-2120
Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
Change-Id: I733be06185e5c19a0b7112918ce0a0f2abf861d7