Move server-chassis to platform-chassis

[mandy-chessell]

Description

This PR completes the rename of the "server-chassis" to "platform-chassis" - both in the module structure and in the documentation and assembly.

• server-chassis and server-chassis-spring modules have been renamed to platform-chassis and platform-chassis-spring.
• The docker file build is now using omag-server-platform-XXX.jar
• The assembly is still creating the server and platform directories

• There are many small documentation changes to replace "server chassis" with "OMAG Server Platform".
• The responsibility for starting and stopping servers has moved from admin services to the platform services. The original admin services are still available (both Java client and REST API) but they are now deprecated.

• The platform services have new REST API operations to shut down all servers on the platform (permanently/temporarily) and also to shutdown the platform.

• There are new application.properties values to set up the platform connectors:
  • platform.configstore.provider - class name of the config store provider
  • platform.configstore.endpoint - name/pattern of resource, eg file name, needed by the connector
  • platform.security.provider - class name of the platform security provider
  • platform.security.name - name of platform to use in security error messages.

Related Issue(s)

None.

Testing

• FVT
• Updated the Postman collections for Platform Services. The Admin Services postman collection is unchanges and still works.

Release Notes & Documentation

There is also an Egeria-docs PR that accompanies this PR to include the change from various forms of "Server Chassis" to "OMAG Server Platform" and updates the release notes.

Rewrote the OMAG Server Platform tutorial in the egeria-docs to use new REST API calls

Additional notes

None