Remove PUT ServiceDefinitions

[seilc1]

Problem

ServiceDefinitions should be defined via the application yml entry com.swisscom.cloud.sb.broker.serviceDefinitions this should be the source of truth. As it is still possible to update a serviceDefinition via the REST Endpoint this can lead to unexpected behaviours:

ServiceDefinitions: NULL
. StartUp - ServiceDefinitionInitializer sets ServiceDefinitions to the application.yml configuration
ServiceDefinitions: Source-Of-Truth
. PUT to ServiceDefinition
ServiceDefinitions: Modified
. Restart - ServiceDefinitionInitializer sets ServiceDefinitions to the application.yml configuration
ServiceDefinitions: Source-Of-Truth

This is confusing if you expected to have always the modified version.

Solution: Remove the PUT Endpoint for ServiceDefinitions and the unused code.