Steps to reproduce:
1. Create a new project
2. Import any DLL
3. Open the meta file of DLL
4. Observe, the .meta file generated for .DLL plugin does not respect the YAML specifications

Expected result: The content of a mapping node is an unordered set of key (Excerpt from http://yaml.org/spec/1.1/)
Actual result: The content of a mapping data includes duplicate "data" keys under "platformData", which is illegal according to the specification.

Reproduced with: 5.5.3p3, 5.6.1f1, 5.6.1p1, 2017.1.0b6
Not reproduced with: 5.3.8f1, 5.4.5p2

Fixed in:
2017.2.0b2