Implement itests for create/delete server

[olkornii]

1. Download and create server: Select connector -> Context menu -> Create server -> Download server -> verify server is created
2. Create server from local disk: Select connector -> Context menu -> Create server -> Select server on disk -> verify server is created
3. Delete the server: Select server -> context menu -> Delete server -> Verify that server has deleted

More info: https://docs.google.com/spreadsheets/d/1-ASTHHyzTl3lYJn3NkI-vzEhe9fwNQ1IPgUrmEFKrnk/edit#gid=0