[INTERNAL] JSDoc plugin: identify enums better
[INTERNAL] JSDoc plugin: identify enums better

Enums were only identified by their set of values and there were some
collisions which can be mostly avoided by adding the file name.

Change-Id: I66fde0a0c9b8cc2368e8650cf3fe0b7bd9b0f6b7

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5