Fix certificate create-self-signed command

Fix for certificate create-self-signed command. Add six non-mandatory parameters. If any of them is missing, the command will prompt the user to fill them.

Fixes http://teampulse.telerik.com/view#item/279831
Merge pull request #554 from Icenium/vladimirov/fix-certificate-create

Fix certificate create-self-signed command
Create service proxy using the swagger endpoint and generate interfaces for the return types
Generated server-api implementation and definition files
Auto generated files
Integration with new server-api