LanguageClient: Opening multiple python files at once blocks annoyingly

Steps to reproduce:

• open QC from command line by passing multiple python files at once
  (e.g. generated python file list from pyside repository or similar..)

OR

• from inside QC use File -> Open File or Project...
• select multiple py files at once (e.g. select all python files from Python's lib folder)

I think QC checks for each file the language client stuff (is pip there? has pyls been installed?) and this is happening blocking - IIRC you promised to make this async - so, please do for the next release..